We had the best time in Marcella's appartment ! It was clean, equipped and perfectly located, in the center of Rome. We did not have to take any public transport to reach what we wanted to see! Marcella welcomed us very nicely and took care of our transport from/to the airport !
There are a lot of bars and restaurants in the neighbourhood. It is really nice to take a walk at night in the streets. Of course it is a bit loudly at night on the week end (even if it is rather quiet on week nights) but Marcella kindly offered us earplugs !
I highly recommend you this place if you want to spend a very nice time in Rome :)