We very much appreciated our studio (Play Room) at Amstel Corner.
-we requested and got 2 single beds (even though its easily reconfigured into 1 bed)
-excellent location, with grocery store very close, in a safe area, and easy walk to centraal, red light, attractions
-complete kitchen (fridge, microwave, stove, Nespresso+cups, cookware/dishes, etc)
-studio was clean, high-tech(internet worked very well), felt safe(cameras in the hallways, proper lighting)
-quiet and cozy and classy, very well designed and furnished. This particular studio doesn't have a balcony but that worked fine with us.
-it`s true that the stairs are very steep, but take your time, there are two ramps, don't rush it and you'll do just fine, and well if you do trip, it's thick, nice, fluffy carpet, you may survive.
-soundproofing was good! we could barely hear people in the corridor or next door, anyway there is only 2 rooms on this floor.
-the staff also very positively contributed to our stay and was always so very kind and eager to help or suggest great things to see or do and they were not invasive at all.