Had a bit of a communication issue with Andrea due to my lack of service in Europe but it all got worked out. The location of the apartment was incredibly convenient and close to everything we wanted - the opera, biosphere, etc. It also had some really tasty local restaurants nearby. The apartment had most everything you'd need. The shower is a nice size as are the beds. There was also a washing machine but no detergent. The apartment was pretty chilly (maybe it's just because we're desert dwellers) and we had some issues trying to figure out how to warm it up. I'd recommend leaving additional towels (I use one for my body and one for hair, and my boyfriend needed one as well...there were only two) and maybe an extra blanket. The beds had only one blanket, no sheets, and no additional blankets in any of the storage (there's usually extra stuff in a closet in most AirBnBs/VRBOs we've stayed at). The fridge had a mini bottle of prosecco in it which was a nice touch. Be prepared to climb lots of stairs, although there is a small elevator - good to burn off all the food you eat! It would also be helpful to know that there's a taxi pickup station on the other side of the fountain. We waited quite a while outside the apartment trying to flag down a taxi (even tried calling a taxi company on the phone) when we could've just walked 1/4 mile to a taxi area.
All in all the apartment had everything we needed and was centrally located. Close to local attractions, restaurants, fountain, and opera.