Our stay at Valentina's house was really great. It's really close to the Colosseum, and walking into town to the Trevi Fountain etc isn't far. There's plenty of shops around, and it feels like a good area, plenty going on.
The flat has a kitchen and washing machine which we loved, it would have been handy if there was already washing detergent and washing up liquid though.
We didn't get to meet Valentina, but we did meet Marcelo and he was really lovely and helped us with our bags. Would absolutely stay there again!