It varies by each location, each contracted deal (usually amazing pricing for the airline to the hotel), and crew requirements per their contracts.

At San Juan, they use both La Concha Renaissance and the Ritz Carlson - I shared a taxi shuttle with the pilots I was flying with from the Ritz to the airport last time - lets just say I didn't have to worry about missing the plane as I felt like I was running late! They told me the FAs were at the Renaissance.

I'm sure it varies a ton though, and I would say San Juan was a bit unique as I don't think crew usually overnight there, but could be wrong.