Maria's place is very centrally located, has easy & cheap parking just accross the road and you can walk to St Peters Basilica in minutes. The house has a big balcony running all around it with nice flower pots. The view is also nice and we had great breakfasts there every morning. Maria is a nice host, she does not speak English, but can use Google translate to communicate.
Would highly recommend the place. We had an issue with the toilet, but that was quickly sorted out.