There's no official hotel. Generally, anyplace in Mountain View and surroundings is a safe bet. However I live a few thousand miles away so one of our west-coast people should chime in.
I live here so don't really have any specific hotel recommendations as I don't stay in the local ones.
That said, the CHM is at the intersection of Highway 101 and Shoreline Blvd. in Mountain View. There are a number of hotels/motels that are within walking distance, depending on how far you are comfortable walking. The Mountain View CalTrain station is walkable as well, if you pick a hotel on that route.
Uber and Lyft own the streets around here so you won't have trouble getting a ride if walking isn't an option.