Carmine's place has an excellent location, 5-10 minute walk from the Firenze Santa Maria Novella train station, 10-15 minute walk from the Duomo (cathedral) and located just in front of the Mercato Centrale ("central market"). However, it may be noisy in the morning (the merchants arrive at 7.00 am).
The building is old and would need some refurbishements. But because it is old, the room had a really high ceiling (approx.4 meters) and was large. The bed was comfortable, the room had a plug-multiplier with EU and US type plugs.
About the kitchen, it is fully equiped (the fridge is efficient and cool drinks rather fast); you also have a bathroom with a washing machine (detergent provided).