My experiences with the Renaissance have been nothing but wonderful!
I've stayed there about 5 or 6 times (I love Munich!). As a Marriott Rewards Platinum, I've always been upgraded to the Executive Suite (62 square meters, fabulous accommodations) even when on a W14 certificate, and received complimentary breakfast even when the rate didn't include breakfast. The staff is very helpful and accommodating as well.
Only complaints: No clock visible from the bed, and seldom get a Platinum amenity. Hey, I can live with that.
(Edited for grammatical error.)
[This message has been edited by Counsellor (edited 08-07-2002).]