We stayed at Lolli’s apartment for 5 days. It is quite old and dated, but cozy and at a great location. Most of the touristic scenes are in walking distance. The bed is really comfortable and we could prepare simple meals in the tiny kitchen. Also there was a hair dryer and an iron, and a lot of pots and pans in the kitchen. The only thing that we really missed is a couch, but if your stay is shorter you would probably not miss that at all.
And yes, the stairs were a bit of a challenge, but we thought they were a good exercise after eating so much pasta and dolci.