I was available to solve any problem, but you did't tell me anything about that.
I could help you!
I think you saw where the apartment was, BEFORE your booking. It's exactly 2 km far from Santa Maria Novella, which is the historical city center, so this was your personal choice. I cannot move the apartment ;)
Bus no. 17 goes directly and deeper in the city center in 15-20 min (depends on traffic then).
Taxi DO come to the apartment, as me (in primis) and many guests called them million times. Taxi go all over Florence and even outside the city, so I find really hard to believe that they didn't come on your call. Probably they hadn't taxies available at that time, when you call. That can unfortunatly happen, but it's out of my control.
Anyway, there are a LOT of other solutions to go to the city center, for example, by car sharing (you could choose between Car2go, Enjoy and Share'n'go) or by bike sharing (Mobike). If I would have known this, I would have told you, but I was completely unaware about this.
In Via Ponte alle Mosse there are at least 5 restaurants and pizzerias where you can eat, a bakery right under the building (which does really good pizza, open till 7.30 pm) and the shopping center Coop San Donato (900 mt far from the apartment) open from 8am to 9pm, where you can eat what you prefer.
I refresh the wall once a year, mainly in winter, during the low season.
I'm really sorry you had a bad experience and that I couldn't help you to get it better!!