We've stayed at both properties and they are fine. They are a block or two apart in the Schwabing district of North Munich...walking distance to the U-Bahn (the Ren is the closer of the two). Lots of restaurants within a 15 min walk (over by the Leopoldstrasse). Both have onsite parking garages if you are driving. Great breakfast at either property...love that weisswurst! Can vouch for the comment on suites at the Ren...was always upgraded as a Gold, even on the cheap rates available at year-end. IMHO the Marriott is a slightly nicer property, but the upgrade likelihood at the Ren, combined with lower rates, would make it my choice.