The very best thing about this apartment is the location! Right near the Palazzo Vecchio and easy walking distance to the Duomo, museums and Ponte Vecchio. The bedroom is set back from the main road so nice and quiet, however the mattress was not super comfortable. There is a washing machine which was a big bonus as we stayed here for a week in the middle of a very long trip. The living/kitchen area is very spacious and the sofa is comfortable.
The biggest issue here is the wifi. Mamo was very responsive in trying to help us get the best connection possible, however I wonder if there is any more that can be done about it. Even the cellular data signal in Florence can be spotty. If you are a casual user, just need to surf some websites, check emails etc. it is fine for that. If you need to work, download or upload large files, you might find this quite frustrating.
We had a couple of minor issues during our stay. The Mamo office was very friendly and responsive to our concerns and were quick to offer solutions.