Sonder was a really nice hotel with a beautiful small room in a great location (near to Gaslamp District). The communication with the personnel was easy and they were very supportive. There was free coffee and water for the guests available which is great.
Only negative: the building is quite old (beautiful, but old), walls super thin and hence you had to endure a lot of noises especially when you were trying to sleep. You could hear people from the other rooms very clearly and the traffic noises or people walking on the streets were even louder.