Absolutely fantastic host!
Make sure you listen to Gemma's recommendations for places to eat/drink/explore/see - you will not regret it. She will give you an insight to the places the locals eat and some of the best places in the city.
Very organised and her efforts to make us feel welcome in her apartment + Florence itself have definitely made our trip that much better. The 5 star rating is meant for hosts like Gemma.
The apartment is simply fantastic, both in terms of location (2 minute slow walk from Santa Croce and some excellent places to eat just round the corner) and the place itself. The bed, sofa, kitchen, lounge, everything all 5 star quality.