Our hostess was fantastic, a delight. The studio was clean and came with some very nice touches. The description given is accurate and the kitchen is very small. We were however able to cook full meals for ourselves. You are protected from street noises but there are building noises, most partially repaired before our departure.
There is no A/C and that would not be a problem except we left the window open the first night. That turns out to be a bad mistake in much of Italy because of mosquitoes - many bits! No mater where you stay you should ask if they are out.
Location = perfect. A few blocks from everything. Walk around the corner to a charming little grocery with modest selection of fresh produce, 3 blocks to a full size one, 12 minutes to the largest in Florence and a sight in itself. Plan to buy your tickets to the Uffizi the day before - shorter line. Or, reserve online and pick up - longer line but in May not bad.