Worst experience in Vegas to date. I come to Vegas 6+ times a year and I had heard great things about the cosmo only to be greatly disappointed. I was supposedly upgraded to a nicer room but the room was not nice at all. I should have known because the clerk was too happy to upgrade. When I tried to get my original room I was told it was already booked. After going back and forth I was given the one bed room with the fountain view that I originally requested. When we got to the room the light controls were not working. Maintenance took a very long time to arrive and could not resolve the issue. They said a tech would have to come in the morning. During the night I got up to use the restroom and noticed the lights in the bathroom did not work. I really had to use the flashlight on my phone to use the rest room at a 5 star hotel. Then in the morning the air vent stopped working in the restroom. Horrible experience I've never been this disappointed in a hotel. I had very high expectations and should have known to not break my loyalty to the venetian because they always take care of me. And if I had this issue at their hotel their management would have made it right ASAP. And not made me "deal with it". Thank you for your time.