Our experience in Walter's flat was probably not a typical one because unluckily the boiler broke while we were there. Luckily, however, Walter is a perfect Airbnb host and did everything he possibly could to fix the problem (it's not easy to get hold of a boiler repairman on the weekend in Italy...). When it became apparent the boiler wasn't going to get fixed over the weekend Walter arranged lovely alternative accommodation for us in the Tuscan countryside, took us on a tour of nearby villages and vineyards, and shared his vast and varied knowledge of the area and its history.

Leaving aside this unexpected detour, I would evaluate the flat as follows:
Pros:
- Excellent location near Ponte Vecchio, Palazzo Pitti, Santo Spirito, etc.
- Nice area to stay in, a bit more laid back than the really touristy centre, and Walter has plenty of recommendations for good, cheap places to eat nearby
- The flat is as it looks in the pictures - quirky and boho, a bit rough around the edges but it's got all you need for a long weekend
- Walter will go out of his way to make sure you have a good stay and is very happy to help with advice and info

Cons:
- The bathroom and toilet are rather tiny. This wasn't a problem for us, but if you have any mobility issues or want a very spacious apartment then it might not be right for you
- It is a very old building which comes with the usual mix of charm and difficulties. If you're looking for a polished, 'executive-style' flat this isn't the one for you.
- The bedroom is at the back of the flat so usually should be pretty quiet. The first night we were there the restaurant / bar next door started playing loud music at 12pm which kept us awake very late. Walter had a word with them the next day, and I also went to ask them to turn the music down the following night, and then it was fine. If you have any problems just go and ask them to turn it down; they were happy to oblige when I did.

In conclusion, a nice, good value apartment in the heart of Florence, but your stay will really be made by Walter who is everything an Airbnb host should be and more!