First off, the good things:
The apartment is clean and it is pretty cozy because it creates the illusion of a real flat someone regularly lives in. More important, the apartment is located perfectly between the train station (perfect when you arrive by train) and the piazza Santa Maria Novella, a beautiful piazza that could be labeled as a gate to the historic city centre. The street itself is very busy and has a lot of nice restaurants and bars.
Second, the not so good things:
You do not have an AC and in summer it can be unbearably hot in the apartment. The propeller on the ceiling is definitely not doing its job. Also, but not as mentionable, you can not expect a great view. You just look into a inner courtyard, which is acceptable for the price you pay. However, what has not been okay was the way the check in was going. We came at the agreed time to pick up our key and no one was there to greet us or explain anything. The waiters in the restaurant below did not have any clue what to do although they where asssigned to just hand us the key. With some delay we eventually got the key. The host never showed up in our 4 day stay. Last but definitely not least, there are no locks for your bedroom door which is pretty shocking, considering the fact that you constantly live with other strangers in one apartment that come and go. Totally unacceptable.
All in all, price-performance ratio is OKAY.