You should do just fine in a 1 bedroom at Riviera. The living room has a Murphy bed for two of the kids, then under the TV is a pocket bed for 1. The pack-n-play for the infant would fit in the kitchen area or could squeeze into the bedroom. Or if 3 kids fit in the Murphy bed, put the pack-n-play where the pocket bed folds down. That’s where we put ours.
Definitely NOT the 1 bedroom at BCV. We stayed there recently and it was a major let down after staying two previous times in Riviera. BCV 1 bedrooms are very tight in comparison to Riviera.
Timing of when the infant goes down for bedtime might be tricky. We had a 1 year old and a 4 year old. The 1 year old would go to bed first in the living room while the 4 year old would hang out with us a little while longer watching TV in the main bedroom. It might make sense to reverse it — put the pack-n-play in the bedroom and have everyone hang out in the living room.