The English instructions are not clear. The number of the house is 5. The street has two doors with a number 5. One of the doors has number 5 written in red. You need to look for the number 5 written in Black. (I think it is between no. 11 and number 13) It is right next door to the restaurant Bulli & enelaB (yes, it is written backwards) It is about 2 doors from the gelati shop. We stopped at the first number 5 we saw but we should have been further up the street. It would have been helpful for host to meet us in the street. Once you enter the door (Black no. 5) you need to walk up the stairs, then continue along the balcony which goes around a corner (Right hand), then continue up the stairs to the top level and walk to the end apartment door (black iron security bars/door) this is the apartment. The apartment is simple but was adequate for our needs.
We also did not have to pay tourist tax or provide personal details to the host.
Other than this initial confusion, the apartment was in a great location right near ponte vecchio and had everything we needed.