I stayed at the B&B Emanuela for 5 nights in May. The only thing that's good about it is that it's not too far from the metro station Manzoni and therefore you can reach the city center quickly.
What's not good about it?
1) It's located near Piazza Vittorio (which is rather dirty and dangerous - you don't want to be walking around here alone at night or any other time of the day for that matter)
2) When we arrived there was no one there to open the door even though we had clearly communicated our arrival time via sms and email
3) At first no one was to be reached at any of the official telephone numbers.
4) Rooms are small and dusty. And instead of a double bed we had two beds moved together (which was not what they had advertised).
5) Around 7 in the morning it starts to be really loud because doors are very thin and the "reception" (if that is what you want to call it) is right next to the bedroom doors. Around seven the cleaning/administration lady arrives and starts talking really loud and making noise - there was no way we could continue sleeping. And since she doesn't speak neither English nor Italian well there was nothing we could do to change it.
6) Price variability and intransparence: There was an Italian couple who payed 40€ per night (half of what we payed) - I know this because the transaction took place right outside our room at 8am and was not to be overheard!!!
In conclusion I wouldn't stay there again!

Although we booked 2 bedrooms for 4 persons and they confirmed their availability almost 3 months on advance, we received and e-mail 4 days before the trip informing that there was a problem with our reservation and they had only 1 quadruple bedroom for the first night, so finally we had to sleep in a quadruple 2 couple, and then we change to 2 bedrooms.
The B&b was very clean and the rooms spacious, the furniture is ok, not very old.
The rooms and bathrooms were never cleaned during the 4 nights that we stayed there although the floor was dirty. They did not change the towels and sheets none of the 4 days.
The person in charge of preparing the breakfast and cleaning the rooms begins the journey at 7.00h in the morning. ,everyday she made a lot of noise talking very loud by her mobile (the flat is small so the noise is heard in all the rooms) and the slams in the doors were continuous, we think that she did it intentionally to wake up all the guest and finish her job early…
The breakfast is very poor, there are not variety: bread, marmalade, butter, toast, croissants (not natural) and a cake (not natural and very dry), coffee and milk, not cacao, fruit , eggs or jam, and not possibility to toast the croissants or the bread.
The first day she heats the milk, but then you should did it by yourself and she gets angry if you ask how to use the cooker.
Personnel do not speak English very well , so it is very difficult to communicate with then or try to get some information about Rome or make a complaint.
We booked the shuttle from the airport through their web page, but we took almost 2 hours to arrive at the B&B because there were more people in the van of other accommodations placed in the opposite side of Rome.
The last day you can leave the luggage but in the “reception” (in the middle of the hall) without any vigilance.
The situation is good, you can go walking to the Coliseum, Saint María la Maggiore y San Giovanni, very near to Termini.
At night is a bit scary, the street is very dark and the ambient not very safe.

Now I'm not a snob in any shape or form and i'm always on the look out for a bargain. In rome there arent any bargains and hotels cost 150euros up, if you think its a bargain it probably isnt.
We booked through late rooms and took all our documentation with us (big tip have proof! of reservation and email Filllipo before you arrive to ensure someone is there to meet you).
We got there about 11ish, found the street Via Nino Bixio, found the large wooden doors walked up 4 flighst of stairs (there is a lift) and buzzed in, met by 'Christina' who spoke hardly any english. On arrival i gave my surname, she showed me a piece paper of reservations for that day and our name was NOT on this list. She preceded to phone several people, (i presume Fillipo), shouted quite loudly and 'NO room', i was not happy, she also said 'Fillipo sleeping' and ushered us into a TINY room marker 'Privado'. all the other rooms had numbers. i did not argue and just settled as i wanted to start sightseeing as time was of the essence, and she wouldnt have understood me.

i had to then email fillipo on my blackberry to ask what had happened to the reservation and complain about the size of the room. He assured me he had the reservation booked and would move us in the morning. i expect he had overbooked and had overlooked our reservation.
This holding room was minging!!! hairs and body hair all over the floor i had to wipe the floor clean, the sheets seemed to have hair all over them, drains in the bathroom smelled.
Anyway we got our head down for the night and we did get moved in the morning to a much bigger room with 2 single bed and double bed in.The bathroom was small and there is a faint smell of drains but we were happier with this room, ear plugs were needed.

Breakfast: was a glass of red grapefruit juice, vacumed pack croissant, vacumed packed melba toast and we were offered a stale bread roll and a cup of coffee.
needless to say we didnt have breakfast there for the rest of our stay, we went to local patisserie which is near the emanual park.

For the next 3 days and nights we did not see any staff nor guests!! Each night the main door buzzer would go off about 2am in the morning, maybe somebody drunk trying to get in or ringing all the doorbells just to gain entry to the block of flats.

on our check out, we left the luggage in the b and b, which was left in front of the reception booth, not secured but we didnt have a choice.
Then Christina tried to charge us again for the cost of the room for 3 nights, but i had already paid by mastercard with Late rooms, glad i took proof of purchase. All i had to then pay for was the 2euro a night tax.

We stayed out in Rome mainly all day and night to enjoy the experience and try not to stay in the b and b.

It is situated in a not so pleasant area of Rome, graffiti on walls, beggars on streets, beggars sleeping rough at night, lots of other foreigners there with local shops etc.
The are not many places to eat out and i wouldnt want to be out later than 9pm on the streets, and i went with my burly husband and still felt intimidated.
10 minute walk from termini station, metros and buses close by.

certainly recomend Roma pass, 25 euros bought at airport, free entry to metros/buses for 3 days, free entry to Colloseum and roman forum (id recomend the headphones you can buy inside approx 6 euros) and discounted prices on all other monuments after you first two free entries.

Average price of lunch 15euros each, main and glass of wine. Tea/Dinner approx 30 euros each starter, dinner, glass of wine. Rome is not cheap.

Good pair of walking shoes needed, from B and B 20 min walk to colloseum and then walk onto trevi, campo de fiori. i would recomend walk everywhere, take metro for longer looking walks to attractions. was close to some of the bigar churches whcih are equally as amazing as St peters bascilla

im not a moaner, just dont like getting messed around and body hair on the floosr/ bedding. i hope this was just an isolated case.
based on the above i would not recomend this place for couples, girls on their own and people who have average standards like me

Stayed here with my partner in Feb 2011 for 3 nights. The room was large and clean, the bathroom was also clean. Had a tv but all foreign channels. Within walking distance of the train station about 5 to 10 minutes walk. If you like walking its about 30 minutes walk to the Colusseum, then you can make you way around Rome looking at the rest of the sites. Enjoyed our stay, the receptionist was friendly. Basic continental breakfast, but needed the coffee for the energy because we walked miles! Rome is an amazing place, and this was a good cheap base, can't fault it.