The Sahara and the room at this hotel were all very nice, but I give it three stars because:
1) The heater/air conditioner vent blows directly on your head when you're trying to sleep. I sleep with a ceiling fan on at home, but this literally felt like sticking your head out of a car window because it was so strong. I tried to block it with pillows, but was unsuccessful. It kept me up all night until I turned it off, the room got super stuffy, so I had to open the window, which was loud. Luckily, I had ear plugs.
2) We had a "do not disturb" sign up in the morning, but in the afternoon, we were leaving the room and requested housekeeping. 9 hours later, we come back and they hadn't cleaned the room. We had to call housekeeping to get replacement towels.
3) The pillows are super uncomfortable, they are very firm so your head doesn't sink into them. If you're laying on your back with your head on the pillow, your chin will touch your chest. I woke up with neckpain and opted for sleeping with a rolled up sweatshirt as my pillow.
There are a few smaller details here and there that aren't worth mentioning, but still lend to the overall experience being just okay. With so many other hotels in Vegas, I'd probably look for someplace else next time.