The flat is nice, but you should know that it is in a basement. There are windows, but you won't have a lot of light. Apart from that, it is very quiet, clean and has everything you'll need.
The location is perfect, centric, but not too much so that you won't be with tourists everywhere. For that price, you won't find anything nearer to the center.
There are supermarkets so you can buy some food, a nice pizzeria and one of the best gelateria of Roma just around the corner. We waited untill the end of our trip to go, and that was a shame.
Now the host. They were the best you can hope for when you go to a foreign country !
Fransesca waited for us at 11 PM with drinks and cookies ("in case you're hungry"). Really !
She had prepared a list of sites to go, restaurants, bars...everything! She told us like five times to not hesitate to call if we needed anything!
If I come back to Rome, I'll go back to this flat !
Thank you guys , and franscesca, I hope your daughter's baby is well !