Luca was an excellent host. Quick to respond and easy to deal with.
Location - if you are doing Vatican tours, book the early morning ones and walk about 15-20 minutes to the meeting place.
The apartment itself is nice, neighborhood is great. Little Pasticeria right around the corner with great Roman Pizza (Pinza?) this place was fantastic for breads, pastries and the pizza.
Other restaurants along the way to Vatican were pretty good too.
Wish I had more time to explore. Metro is probably 20 minutes away. Just a guess, we walked everywhere.
We had a couple of issues pop up for Luca at the last minute: Previous guests broke the washing machine (ouch, we were counting on doing laundry), the shower door was wonky (probably needs a new one) and lastly, one side of the bed has a major "hole" in it. Made for it a tricky for a good night's sleep, but after walking 8-10 miles, I was able to overcome.
Would I stay here again - yes. Fix those 3 things and this is a 5 star location.