I stayed just over 2 weeks with Catherine in a wonderful studio with the view to the Bascillica - I would need to pinch myself in the evening the night lights on it and in morning.
The studio was very comfortable for me, I was working and being a tourist. I could cook when I wanted and enjoyed the daily delivery of breakfast croissant and bread bun. the 24/7 supermarket is about 10 mins max to walk so easy for self catering.
Being close to the station and the bus using public transport to get into the centre or elsewhere is easy and convenient. I mostly walked as I just loved walking past Vatican city each day - only 15 min max walk into centre - 5-10 mins to St Peters. A great location just out of the very tourist hotel spots in residential area but very close to everything you need.
Catherine is a happy, generous host - right down to having a little table with daily sweets, fruit, water, sun and insect spray - plus other stuff.
I would definitely highly recommend staying here - I was one person, I was working as well as visiting so it worked for me.