Agostino was very nice and welcoming.
The apartment turned out to be even bigger than we expected!
Absolutely amazing location: literally 5 min walk to Castel Sant'Angelo and then 5 more to Vatican. In fact, we walked to all major tourist attractions (Colosseum, Pantheon, Villa Borghese, etc...). It is also on the edge of a rather touristy but quite cozy district with numerous shops and restaurants.
The place is a little noisy (nothing you can do about it in an old building, so just bring a pair of good ear plugs) and a little chilly in winter (also, normal for Italy, just be prepared).