Hi, I'm struggling to find a hotel (not air b and b) in Suzhou in the price range of about 650 Yuan per night for 2 singles - we'll be there in December and there are lots of hotels available for that price but here are a few stipulations: we want aircon operable from the bedroom, and basically a relatively decent room.
Would appreciate any recommendations

Really hard to go wrong with Atour. Perfect mid-range hotels with virtually nothing to ever complain about. Not sure if you mean 325 per room or 650 per room. Atours average around 350 a night. They have multiple locations in pretty much every Chinese city.