The Westin Phoenix Downtown is a fantastic hidden gem!
I had the pleasure to stay there for a girls weekend getaway, and was amazed at how beautiful the hotel was. You walk in, and the smell reminds you of relaxing away at the spa. The associate at the front desk was very friendly so check-in was a breeze, and we were surprised to see how gigantic our standard room was. The room was easily double the size of most normal hotel rooms, which made us feel super relaxed and comfortable. Plus, they are known for their beds (Heavenly collection, that funny enough you can purchase!), so sleep and comfort took control of the stay.
The other great thing is the location. We were just a few blocks from City Center, as well as many other restaurants and bars, so it was very easy to explore the city without a car.
I would definitely book a return trip back to the Westin the next time I need a hotel downtown :)