Great apartment for short- and mid-term stays. I stayed in Monique's flat for 8 weeks and don't regret anything. The communication was great from the beginning and check-in until the end. If I needed anything, Monique made sure to help me. The location in Santo Spirito is perfect to enjoy the proper Fiorentinian life. The flat was well equipped and tidy, only the kitchen could maybe have better equipment (only two sharper knives, two hobs e.g.).
The only downside of the flat is that there is no direct sunlight or windows two the street. All windows face light channels (the first picture is from the flat above, which Monique owns as well), which can be an advantage as well though, as the flat doesn't get too hot on Summer days (it also has an a/c if it should ever do).
All in all i can only recommend staying at Moniques flat. I would come back anytime!