I stayed 3 nights with a friend at Ilarias flat in Rome.
In general, I had a great time in Rome.
Sadly, I have to mention a few points that were disappointing:
1) Cleanliness: The place could use some cleaning. There was a layer of dust in the bathroom and in the shelfs in the room.
2) Smell: A dog lives in the appartment. While we didn't see him, his smell was all around, also in our room. The bed somehow also smelled like dog, not sure if he was on it before we came or not, but the smell was definitely there.
3) Cell-Phone reception: The walls are so thick, that there is no cell-phone reception in the flat. As there is also no WIFI, the only way to get at least some connectivity is to hold your mobile out of the window.
4) No space to put clothes: as the shelves in the room where dirty, we basically lived 4 days out of our suitcases. Can't blame Ilaria about it as I haven't complained on-site.
5) Bed: The bed is ultra-hard.. the mattress is very thin and you almost just lie on plain wood. The blankets are very old..
On the bright side, there are also some good points:
1) Ilaria is a very nice and forthcoming person. She reacted very promptly and checkin as well as checkout was painless.
2) The flat is very central and you can reach most of the sights by walking.
3) The price with 40 Eur/night was OK-ish because the location of the flat is very good and central.
I can recommend the place for young Students doing a weekend-trip to Rome.