Maria's flat is fantastic. It is well situated in Trastevere down a quiet street, so you can enjoy all that Trastevere has to offer without the noise. It's then a short walk across the river to Piazza Navona, Campo di Fiori, etc. The place is fairly spacious - I never felt cramped. It's newly renovated, so everything is in good working condition, such as the washing machine and dishwasher. The wifi connection works well too. And as a host, Maria is very welcoming and a pleasure to deal with. She runs things well.

The only catch is the electricity bill. If staying for a longer period, you should budget extra money. There is a built-in allowance into the rate. However, it is only appropriate for shorter stays. I was an extended stay guest, was out of Rome for half of the time, did not use heat over the winter, and still ended up with a chunky charge to pay last minute.