OT for this thread, but Doubletree is the least consistent, most haywire and unpredictable, of all Hilton brands. It is literally a grab bag of Hilton-doesn't-know-what-else-to-do-with-it properties: converted, acquired, deflagged by competitors, etc. The DT Tower of London is modern and comfortable, spacious and lovely; the DT (insert US airport) might be a threadbare, neglected, ill-lit, cracked-paint '70s relic. Inconsistency might as well be a literal Doubletree brand pillar. At least ES have predictable room layout.