I am in Marriott FS Warsaw now.
First trip as a Plat. I did not get a corner room but I did not ask, so nothing strange.
Something strange : I had booked 5 months in advance and they did not send me the usual confirmation by email 5 days before the stay. I wonder if they did not hope I would forget the reservation, so that they can pocket the no-show penalty and avoid to give me a room at the low rate I got.
They advertise lot of a restaurants but half were closed this week-end. There is a nice "patisserie" with cakes and sandwhiches on the ground floor, though. Food is ok at the italian restaurant and Champion sports bar.
Sometimes the vent in my room made a strange noise and I had to cut it off, the bathroom need some plumbing refreshment, but otherwise everything was fine up to now.

Would I go back next time in Warsaw ? Yes, and I will ask a corner room, but the room I am staying in is ok though...just lacks something to make coffee but it is very near from the 24 hour opened lounge and anywhere I did not ask so I can't say if I would have gotten it or not would I have asked.