We really enjoyed our stay at Susy's place - would definitely recommend it!
The place is huge for 2 people and would fit 4 people perfectly. The kitchen is well equipped and the beds are very comfy. Really good value for money.
It is extremely close to the Metro line A (2 minute walk) and from there it is easy to access anywhere such as the colloseum or the Vatican City within 20 minutes. The bus stop is even closer than the metro and this will take you to Trevi Fountain in about 15 minutes but these are not as frequent. The apartment is also close to San Giovanni basilica (about 3 minute walk). We would recommend getting a Roma Pass as this will save time queuing for hours at attractions and having to pay for public transport tickets.
The only negative we have about the apartment is that you cannot use many appliances at once otherwise the fuse will blow. However, it was very easy to resolve (just flick a switch by the door) and this only happened to us a few times within our 5 day stay.
We would definitely stay again if we came back to Rome.
Emma and Tom