Francesca's apartment was ideal for our sightseeing week in Florence in August 2018. We arrived outside of the normal check-in time, but this wasn't a problem. After a quick online dialog with Francesca, we were sent detailed instructions on how to send her the right information and how to use a 'Keesy' kiosk. This is near Florence's railway station, where we picked up the keys to the apartment (and dropped them off at the end).
There are a lot of steps up to the loft apartment (77 if my count is correct), but it's worth the effort to stay in such a lovely, large space with high ceilings, two sofas, and dining table and chairs. The aircon in the apartment works very well which meant that although the temperatures outside regularly hit over 35C, the apartment was always cool and ready for a snooze during the heat of the day. We were welcomed with a bottle of red wine and a large bottle of mineral water in the fridge. It's also worth mentioning that a benefit to being in the loft apartment was the peace and quiet. I'm a light sleeper and with the aircon on and the windows closed, there was very little audible street noise.
The apartment was spotlessly clean and well equipped. We didn't cook while we were there, but it was clear that there was adequate cooking equipment as well as a hob, microwave, coffee machine, fridge/freezer, etc.
The particularly strong point of Francesca's apartment has to be the location. Via de' Cerchi runs through an area of narrow streets between the Palazzo Vecchio and the Duomo. In these streets are a good variety of restaurants, pizzerias, bars and places to pick up a panini for lunch. From this location, we were easily able to walk to all the central places of interest during our visit.