The space was a great size for 2 people, I didn't feel like I'd trip on my suitcases, doorways were tall enough for my husband (everything in Europe is so LOW), and it was clean. The bed was decently comfortable and the bathroom was a good size. Also appreciated the AC unit at night time when it was warm, and the big drying rack to hang laundry after washing (there is no balcony). The host also put together a helpful book of instructions, including emergency information, washing machine instructions, and favourite restaurants (although we tried to get into several of them and the line was too long or they were way too expensive).
A few things to critique - PAY ATTENTION TO THE HOST'S WARNING ABOUT THE STAIRS. There are 89, to be exact, and that's many more than you'd expect for 4 floors. Do not stay here if you have any mobility limitations. My husband and I are pretty fit people and we had to stop each time we came back to the unit to catch our breath,the steps are very steep. Also dragging our suitcases up that high was a nightmare. Again, the host warns you that there are many stairs, so I'm not upset with her, but it's more than you'd expect. Also as I mentioned the bathroom is a good size but beware the very small shower (typical in Italy it seems). I banged my arms on the sides every time I put them up to wash my hair, it's very narrow. Finally, the host seems very nervous/anxious about guests, which made us feel a bit unwelcome. She asked many questions before we arrived, and messaged the day before we left to remind us to leave on time and to clean up the kitchen and bathroom, and take out our own garbage. For some reason this rubbed me the wrong way, and I can appreciate that this is someone's home and you have to be respectful of the space and some renters may not be, but we were very clean so it kind of felt like a parent nagging you and that's not a great feeling.
For the comfort of the space, once you catch your breath from getting there, I give this rental a good rating, but a couple of details brought it down to a 4/5.