I've stayed at the Ren in Paris (near La Defense) Hotel itself was decent. It's a short metro or RER ride to the main areas of Paris. Not as convenient as the new Paris Marriott but it was a THIRD of the price. Can't beat that.

I stayed at the Tokyo REN 2 weeks ago - what a dump! Fantastic location in the Ginza but the rooms were VERY small and in need of a renovation. All the signage still said Ramada even though it's part of Marriott. Trouble is the Marriott in Tokyo is geographically undesirable so it's back to the Century Hyatt for me.