I was welcomed on arrival by Antonella and her husband and communication previously had been extremely good and informative.
The apartment was exactly as described and very clean, bright and airy. The bathroom is small but modern (though a shelf to put things on would be welcome, also a hook for a towel) and the warm water comes through pretty fast. Kitchen has everything you need - except a cutting board - with loads of pans, knives, and little things like grater, nut cracker, scissors. There was some coffee (for an electric espresso maker), teabags, salt and sugar and some water in the large fridge.
The terrace is really pleasant, more roomy than it looks in the photo and has the sun all afternoon.
The bedroom has a big comfortable bed and loads of cupboard space with hangers.
I was visiting in April so the temperatures were Spring like so I can't tell if the air conditioning is effective in summer. The windows and doors have shutters which you would close in summer to keep out the heat.
A main plus for me was that the apartment is extremely quiet, with all the windows opening away from the road as you can see in the photo of the terrace. Also the large park Cascine is only a few minutes walk and jogging along the Arno with a distant view of the Ponte Vecchio is not a bad way to start your day. There are many restaurants very near by including a couple of vegetarian ones and it is one stop from the main station with the tram running every few minutes.
I was working nearby in the theatre so the location for me was perfect. However, a tourist staying for longer than just a weekend who wants to visit the main sights in the centre might get irritated by the 20'-25' walk to the cathedral if he's going in more than once a day, especially in summer which is hot. Having said that there are various routes in, so it is not boring, also on the south side of the Arno.
Last thing - if you need a taxi when leaving order it in advance (Anotnella has some numbers on the door as well as leaflets with all the normal tourist info). There were none available when I made my impromptu call, and I was lucky to find one outside and make my plane.