To each their own.

The Doubletree is nothing to write home about, although it is a short walk to TK... which is nice (does anyone really take the shuttle?). Their restaurant (which was pretty good two years ago) is/was closed. Minimal decent restaurants nearby. The gym is sub-standard. Nothing nearby if you stick around for your days off.

For a 4 week training course, staying at the Sheraton is by far my preferred option.