The rooms are a bit Spartan, but everything functions well. that's the only reason I would not give it 5 stars. What is really fantastic about this hotel/restaurant is the restaurant. The food quality is exceptional and the indoor/outdoor restaurant is open all day and nigh, and you will be served whatever you want at any time you want. This is important when you are jet lagging. breakfast at 5:00 pm, no problem. Sit down and have a coke at dinner hour, no problem. but the food is exceptional. Everything on the menu was excellent. I enjoyed several dinners, and others who I knew staying there, from the conference we were attending, had exactly the same experience. Stay at Upper Diagonal for the food, service, and cleanliness.