It was six of us at the apartment and I believe it was great for the price we paid. It was close to the train station which was really nice
My only complaint was that one of the bathrooms downstairs had a bad smell every time you walked in, but other than that it was nice, clean, and affordable!
Do keep in mind although you are close to the train station - you might be further away from nice clubs, Piazzale Michael Angelo, uffizi gallery, and some other places and taxi’s can be scarce. Also keep in mind that there is no elevator so try to pack light as you have to walk up 4 flights of stairs.
Other than that, Florence is a wonderful city. Thanks!