We got a special on Groupon for 3 nights for $258 (plus tax, not included) and went up last weekend (11/30-12/3) for a winter weekend getaway. We reserved early, and when we got there found we had been upgraded to the jacuzzi suite which also included a complimentary bottle of champagne. The room was large, slightly dated but fine for its purpose. It had a fridge, table, large TV, king sized bed, HIGH POWERED hair dryer (YEAH!!), and the jacuzzi came with an ice tub and champagne glasses, plus those battery powered candles. The hotel also had all the amenities you could want. Indoor pool, hot tub, sauna, amazing breakfast, fitness room, any toiletries you may have forgotten (free), etc. The service was excellent and people were very nice. Also, definitely agree it was very clean. We saw one of the rooms being cleaned after checkout and the housekeepers had the mattresses up against the wall and were cleaning underneath!
We read all the bad reviews before coming, and they all seem to be based on inconsiderate guests which is nothing the hotel can control. Overall we have nothing bad to say about this place itself. If we come back we probably won't stay in the Hyannis/West Yarmouth area because it's less old/quaint than the other Cape Cod towns, but if this is the area you're looking for the Bayside is great!