As many other reviewers have said the apartment is clean - and easy to keep clean; its very, very quiet; spacious and comfortable: the main bed is excellent and the bed settee was very comfortable to sit on. Hassle free and welcoming check-in.
The description of the apartment is accurate and the pictures should give an idea of how large the apartment is: bathroom and extra toilet on the left as you enter, corridor down to the main room and the bedroom beyond that. Large rooms. What the pictures don't really show is how light the apartment is; sunshine will illuminate the bedroom in the morning and later illuminate the courtyard that the main room and corridor overlook the internal courtyard). You can get a through draft as well if you wish by opening windows (and its still quiet if you opt to do so.)
With a washing machine, dishwasher (plus detergent), three air conditioning/heating units - which are very quiet in eco mode; a high standard shower complimented by a generous supply of bath sheets and hand towels the apartment is equipped to an above average / high standard.
Regarding location. If you want a view of the Duomo - this isn't for you. If you want to walk out into the mass of crowds near the Uffizi - this isn't for you. If you want somewhere quiet and tranquil but close enough to walk to all the sites this is ideal. Most sites - Pitti Palace/Uffizi/Academia/Santa Maria Novella - are just under/over 1km away. And if you arrive by train the railway station is a flat c. 1km walk away although bus and taxi options will drop you outside the apartment. (A parking token was available but we didn't come by car.)
And although the street entrance is on a bus route once through the door on the street you walk along a corridor away from the road; the end result being its very, very quiet. (Three sets of 7 stairs up to the first floor which are wide and wasy to ascend.)
The area nearby has a wide selection of places for to eat out - the Santo Spirito area is frequented by non-tourists so better options. And for when you want to eat in there is a Carrefour and a couple of Conad stores within a few hundred metres and a larger Esselunga a little further away. Or an option to pick up bread say near the Ponte Vecchio on your way back. And the apartment has a hob/oven/microwave/kettle/toaster plus pans, colanders, knives, a grater and so forth to make this a viable option.
In summary the apartment is an area of tranquility that allows you to relax and enjoy your stay in Florence as you want.