The apartment is small, but comfortable and very practical. It was really clean throughout and perfectly warm (we were there for New Year). It's also nice and quiet, as it faces out on both sides onto interior courtyards; plenty of natural light, too.
The neighbourhood is a bustling and dynamic area. The supermarkets are fine and very close by; there are a couple of convenience stores (longer opening hours) just across the street; and there's a busy, locally used daily market also right across the street.
You can actually walk into the centre in about 25 minutes. But if you're heading further afield, the apartment is really well located for a number of busses and metro trains, all of which are a short walk away.
Finally, Chiara is a wonderful host, friendly, very attentive and responsive. The information she provided (apartment; check-in/out; area; restaurants; transport, etc.) is relevant, updated and generally excellent.
All in all, a great place to stay in a wonderful city.