The flat was exactly as advertised, it was spacious and extremely clean. Martina was a very accommodating host. Amongst other things, she would suggest restaurants and give maps to make our lives easier.
It is in a good neighbourhood not far from the city centre.
And most importantly, there is indeed a parking spot on premises that you can use. It was very useful for us.
We highly recommend this flat to anyone who wants a memorable stay in Florence.