I stayed at Giovanni & Cosimo's place recently for multiple days with a close friend. There were technically two beds, but the main bedroom was so spacious we just shared that bed!
The amenities are completely as described. The only slightly odd part was the toilet which was a bit hard to flush. But it fully works. The space is very nicely decorated, and you really feel like you're living in Florence when you're there.
Also - Giovanni & Cosimo leave homemade biscotti and jam which is such a great. A great stay!