We really enjoyed staying at Renzo´s place. The flat is really good equipped, clean and has everything you need.
Renzo buyed some milk, marmelade, yogurths and other stuff for us which was really nice of him. The flat is in a quite neighborhoud. It is about 30min from the center, if you like to walk. With bus or tram it is about 10-15min. But we really enjoyed the walk to get to know the "real" Rom. Trastevere is a great place, with a lot of nice bars and restaurants.
We definetly recommend to stay at Renzo´s place!