This was a wonderful apartment. As you will read in the many other positive comments for this apartment, the location is fabulous, Roberto is a very quick communicator, and it is so much fun to see the parade of gondoliers go by from the living room window. The wifi worked well. It was particularly easy to get to the airport from the apartment, and Roberto gave clear instructions beforehand about how to get there. We highly recommend this apartment.
That being said, we had two issues with our stay. First, there were no sheets for the sofa bed the first night, and since we didn't notice this until 11pm, one of us had to sleep without sheets or pillowcases... Roberto kindly brought us sheets the next afternoon, but as this is a 'two bed' rental we were counting on using both beds. The other issue was that the AC didn't work. It would work for about 15 minutes then stop. This issue was not resolved for our 4 night stay.
Also, if you are a light sleeper, I would recommend bringing earplugs, as you can hear the people on the floor above when you are in the loft bed. With earplugs, it didn't bother me at all.
Again, the apartment is great, the location is wonderful, and what you see in the description is really what you get.