Sunset Roma is a door in the wall about a kilometre from the Coliseum. It's an easy walk. We stayed in 2 different rooms, neither with a view.
The rooms are spacious and clean with good bathrooms.
The airconditioning temperature was good but there is no facility for occupants to adjust it. In room 23 I found the fan noise a little obtrusive at night. Room 12 was fine. Included wifi was great and fast.
Andrea's English is good and his recommendations for places to eat were spot on.

The hotel is located quite close to a metro stop (Cavour) and only a short walk from Colosseo. You can explore most of the historical center of Rome by foot, therefore there is even no need to purchase any prepaid metrocard (I recommend just to buy a 1-euro ticket for some of the longer rides - e.g. getting to/back from Vatican).

Back to the hotel itself... We had a triple room on the first floor (was it #12?). The room was large enough and was perfectly clean. Nevertheless there were some downsides due to which I cannot give it a high rating:

1) The airconditioning might be working well, but it is operated centrally (you need to call someone to adjust the temperature if it's not convenient)
2) The only window in the room faces to an external air conditioner unit with the fan forcing the hot air into the room if you open it, also the daylight in the room is quite limited by this (the second window is in the shower).
3) The beds are incredibly hard.

Altogether I would give it 3 stars (for this stay), however, I decided to go for 4 stars since it might be valid just for this specific room. If there was a more comfortable/softer bed I might give it even 5* :)

Btw. if you need parking, try Via Milano only two blocks from the hotel (seems to be free of charge).

We have spent two nights at Sunset, and still have one more, but couldn't resost sharing our positive views of the place.
We travel a lot, and frankly it has been a long while since we have been happier thn expected in a hotel. We all know this sad feeling that a hotel doesn't live up to its pictures. Well, not here. First, the rooms are great. For the price and location, this is tremendous value for money. The street is silent, the hotel has just been refurbished with great taste (the wood ceilings make the room, really, while the rest is simple modern but very comfy), the location is convenient with most attractions between 5 and 20 min walking distance (you can find more central, but not at that price and for this quality), and the staff is incredibly nice and helpful. Plus wifi internet is free, almost a rarity these days...
This is the kind of hotel you always hope you end up in, reasonably priced, well located, with a great service, but without sacrificing service or decor in the room.
We would definitely recommend to anyone looking for a hotel in Rome for less than 100€.

I come to this hotel every time I travel to Roma. It is simply perfect. Godd price, clean rooms, fantastic location. Breakfast is not provided, but you can easily have a good cappuccino, a croassaint and a juice for 5 euro in a nearby coffee bar. I often advice this hotel to friends and relatives too, they have always been extremely happy.