This place is (I am not kidding!)
a. Not close to St. Pietro Square
b. This place has no nice restaurants or breakfast places close by
c. had a screaming baby in the room next door
d. the prices of services DO NOT deliver value
e. Although the hostess who runs the place is nice, she has no idea what she is doing.
f. If you are a couple seeking a nice relaxing luxurious break, this is an ABSOLUTE NO
g. the bathrooms are super small
h. there is one room which is big in size, but the others are just gaudily bright!
i. the rooms names are based on the colours of the walls, and I am not joking, our walls were fluorescent!
j. lastly the only thing that saves you here is the air conditioning in the rooms which is powerful enough for the Italian heat!
k. oh and did I mention that because the hostess wants to save electricity bills, the place is completely (and dodgily) DARK when you arrive back, we had to literally fish for the light buttons for 10 minutes before we figured it out, meanwhile someone could have harmed us in the dark! Now that is not a great experience for a holiday~
l. COUPLES I INSIST DO NOT GO HERE

This place is NOT for you if you like to take one good vacation per year! It is far from all the major attractions and the verde room which we stayed in is particularly gaudy. The air conditioner takes ages to cool down the room and the overall entrance of the building is a put off.

I found this b&b very nice and cosy. The owner Tiziana is extremely kind and welcoming, the rooms are big and very well furnished and the breakfast is served on a big balcony. It is a little bit far from the city centre but the bus stops right in front of the building and the Vatican City is just a few stops away. I highly recommend this place.

I stayed at B&B San Pietro - Sep 2010

Pros
1. Good Value
2. Clean
3 Internet with one shared computer
4 Friendly staff
5 Supermarket near by called PAM
6 Own shower and Toilet
7 Own Cooker, Sink and Fridge (small)

Cons
1. Breakfast was not always early, considering nothing was fresh except the coffee
they could have left our breakfast in our rooms the day before so we could have break fast at anytime and go out at anytime. Once I waited and thought not worth the wait I am wasting valuble time in Rome and just brought breakfast.
2. It's was not that easy to find as it was a flat in an appartment block - so you can't see a sign from the street.

The B&B was about 10 to 15 mins walk from the tube station which is ok, not too far.
You kept the key until you left unlike some where you have to give the key back everytime you go out, not sure if that is a pro or con - you have the feeling of more freedom but then with pick pockets maybe its a good idea not to have the keys.