I cant give you recommendations because ive only been there a couple of times myself and tend to stay in the cheap dorm style places anyway.
What i can suggest though is that you consider the area youre staying in.
Hirafu is pretty much the apres center of niseko. Annupuri puts you in the quieter more sedate part of the mountain. If youre looking for more of a do it all kind of trip meeting people and getting wasted, then you probably want to find a place in hirafu. If however you want a more peaceful and, lets say for the sake of trolling, a less bogan style vacation, then annupuri might suit you more. The advantage of annupuri is that it has quick access to the gates, is much less busy than hirafu and other sytuff (honestly, im no expert on the place). The advantage of hirafu is that it has a massive comparative area to ride, its got a more party atmosphere and of course the big pull, it has an amazing night skiing area.
Again, i should add, i know next to nothing about this place, but thats the quick vibes i got from them.