We can recommend staying in Rosa's appartment for sure. The appartment is near the train station and bus station and also it is close to the Vatican (just few minutes by foot) so location is great.
In the apartment you have your own room, bathroom, closet with a desk to prepare simple food or drink. It is separated from the rest of the appartment so you have your own space. Everything is clean and looks really adorable! The place is full of art (in awesome paintings and also in small details).
Last but not least, your host is here for you when you need. From the arrival when she recommends you the best way to get to the appartment, give tips for places to see and where to eat until your departure.
Lovely place! Thanks :)