First, the good: very spacious apartment with tall ceilings, great location in Centro Storico, they kindly let us check in early and they gave us coffee as a welcome gift.
Unfortunately, the rest of the experience was not as positive. We booked this place specifically for the strong wifi they advertised (and we told them it was why we had chosen the place). However, the wifi was terrible (7.5 mbps - couldn’t support video calls at all). When we asked if they could check on the wifi, they became completely unresponsive, and totally ignored our multiple messages for 48 hours. Finally, we decided to leave the booking early, and only then did they respond - to ask if we were out so they could come clean the place. We did get a belated apology from Karin at Wonderful Italy, but only after we had left.
I think communication is the most important thing in this situation - the wifi situation was unfortunate, but the fact that they totally stopped responding (when previously they had been very responsive) was the most disappointing part.
Also: note that there is no AC, just fans, so I do not recommend booking this place during the hot summer. (Not their fault of course, but just to be aware of.)