The space is beautiful and has everything you need. The location is fantastic, within walking distance from the train and bus stations, supermarkets, the bridge along the river and major piazzas. Fairly spacious for a European apartment but if you find the kitchen is too small for cooking there are plenty of restaurants nearby with great food and affordable prices. It does get noisy at night, but no more than any major city. Karin is a gem! She greeted me with a warm welcome, provided me with a tourist map and outlined a walking tour to all the main sightseeing locations, she even gave me tips of where to get groceries and where to eat that's cheaper than the typical tourist places. I couldn't have asked for a more convenient apartment and a better host.
PS. If you're not the backpacking type beware of stairs and cobblestones, rolling suitcases aren't great for Florence.