Five of us stayed in Wallehen apartments and we were impressed. We were on the top floor of a four apartment building. It was nice and comfortable and warm. 2 comfy double beds, a third double bed/settee in the lounge. Seperate bathroom and shower.
The apartments are very close to the piste and you can ski down to the Schattberg lift...which is handy.
Bad points - No bath (just a shower).
Also, we were asked to pick up the key in village called Karcham which is outside of the Hinterglemm valley. This was ok for us as we hired a car but if you go via the bus or taxi shuttles it might not suit you.
Overall, good quality at a decent price.