You can expect warm welcome and a great location here.
The area around is lovely. There are some wonderful restaurants here (especially those your host will recommend), a supermarket just below and everything else that you will want here.
And yet it is not far from all the tourist spots to which you can walk or take the bus. The buses are really easy and good value, and the walk is lovely.
There is huge park nearby which is lovely, and there are some great views over the city which we were on our way back one afternoon.
The guest house itself is good, with a very friendly host :-)
Our room was a good size. One thing to note is the bedding is a sheet as Rome can be warm, especially in summer. If you need something a little more, then check in advance.
Do go to the restaurants you will be recommended. If we had had more time, we would have gone back to them again.
I would very much recommend this as a place to stay