The apartment is in a great location for day and night. Within 10 minutes you can be at the river and over to the main tourist sites. At night you get more authentic places to eat and drink if you want them! Modí provided us with some great recommendations.
All of the communication was really friendly and fast.
Being able to self check in was really easy too.
The apartment had everything we needed for our few days in Florence, and I would definitely stay here again.
The only negative would be that you can hear traffic noise and people outside the apartment at night (being British I'm used to double glazing to keep the sound out!) But this is what you to expect in most cities, so this is not specific to the apartment and is just something to be aware of if you're a light sleeper.