One of the main advantages of the apartment is that it is very close (6 min walk) to the main train station in Florence which is a huge - given that Florence will likely be the hub for day trips to Pisa/Cinqe Terre and to Siena/San Gimgnano (highly recommended) and surrounding areas. Additionally, it is very close (10 min walk) to the local attaractions (museums, cathedrals) in Florence. And just 1 min (yes 1 min) from the very famous outdoor leather market and the indoor Mercato. And lots of nice restaurants nearby.
The apartment is on the second floor with no elevators, so be prepared to haul luggage up the stairs. The two bedrooms are quite big, and one of the bedrooms has its own balcony and AC unit. The common room also has an AC and the wide doors of the second room allow for the cool air to flow in. We visited Florence during a massive heat wave (102 deg F during the day), and the host was kind enough to provide us with a table fan which worked well in the second bedroom. The bathroom is quite updated and also has a washing machine (clothes can be hung to dry on the clothesline on the balcony). The kitchen is a bit lacking but adequate to cook small meals if you have the time - best to save time and eat on the run while you enjoy the local sites and trips in the train to Siena/Pisa.
The only negative about the place is the WiFi. The signal strength is OK but the connection is likely through a very lossy cable connection - so we were barely able to use it. The one time I tried to assess it over speedtest.net, I got 800 Kbps downlink - even basic Whatsapp did not work. But if you have your own SIM (I recommend getting a TIM for visitors), then the lack of WiFi at the apartment did not bother us. Perhaps the situation has been rectified - and even if it is not, I would still recommend this place for all the other advantages it offers.
Overall, this was a great apartment right in the middle of Florence, steps away from everything - trains, local sites, eateries, shopping. Walk everywhere and avoid the taxies :-)