My mother and I booked Annalisa and Leonardo apartment over Christmas for 4 days. It was perfect for us- location is great, close to sights, train station and has great restaurants right on the door step. Leonardo meet us outside and carried my suitcase up the stairs, he gave us a lovely tour and showed us how to work everything. Then he gave us great recommendations for food and just generally made us feel welcome. They had even left us a small bottle of prosecco and panettone as a Christmas gift.
The apartment is beautifully designed and very easy to keep nice. It's a perfect size for 2 but might be a squeeze for 4.
My mum was worried about the amount of stairs but we really didn't find them too bad, once you do it the first time and know what your up against then it's easy it mentally prepare.
I would highly recommend this place and will definitely try to return again soon.