Well, we do a 1BR with our twins DDs (are turning 22). They share the pull out (though OKW, BLT and AKV- Kidani have 2 pull outs, one is a chair pull out, and they get their own then and the pull out chair is super comfy, way better than the pull out sofas). We also di a studio at Poly and one slept on the flip down TV bed (though very small and cramped so not really for a full sized/aged adult, though my DDs are 5'9" and can sleep on it) and the other in the pull out sofa.
I'd say a 1BR is fine if A) someone doesn't mind sleeping on pull out...and B) you all don't mind waking and sharing the kitchen/living space as in ...is everyone on same sleep schedule?.... With our 20-something DDs, we bring coffee maker into bathroom and can wake early and make coffee and hang out/shower/work....even quietly sneak out door to go somewhere. Because our DDs sleep until like 11am. We wake around 7am.
I do think Riviera 1BR has a flip down bed from the wall (murphy bed)...real mattress and not pull out sofa bed. SSR is renovating and putting same in there. They have the preferred view at SSR that are done renovations. That 1BR has a big murphy bed and a little flip down bed under the TV (single) too. Real mattresses.