Alex has a nice apartment that is modern, very clean and in a good location.
I encountered some issues however. Firstly, the apartment is up 3 flights of steep + narrow stairs which is very impracticable if you have large suitcases or a bad back. It was difficult to get our suitcases up and down the stairs upon check in/out.
Secondly, the main lock to get in the building is very hard to operate. While this was acknowledged at check in, one day after we came back to the apartment, we struggled to get it open for 20+mins. Alex did not answer his phone and the porter was dismissive when we asked for help and told us to try harder. As 2 young girls alone in a new city, we were scared and cold as we thought we were going to get locked outside.
Lastly, an oven was advertised but was not present in the apartment.
Issues aside, it is a nice apartment for a couple of nights in Venice, but would avoid if you have large bags or trouble climbing stairs.