I stayed in a suite at the Renaissance late last October as well, as it was only €15 more than a regular room. Given its non-central location, the hotel is very empty on weekends, and I would assume an upgrade to a suite would be easy to come by for a Plat.

My suite was indeed large, with a slightly odd layout: sitting area, round dinner table with nearby sink, separate bedroom but without door, walk-in closet with makeup table, very long bathroom with entrance at each end. My room had a full complement of women's magazines although I am a man...
Access to the top floor is confusing (must change elevators) and the hallways very long.

On Saturday morning there is a lively street market right next to the hotel. Staff was courteous throughout.