As far as I know no Singleton Park accommodation has double beds, Bay has slightly larger than single but not double. As far as biggest communal area probably Cefn Bryn (I've attached a pdf of the floor plan) but you've got to share that 1 kitchen with 18 people. Preseli (other pdf) has 20 beds but its ensuite, and you share 2 smaller kitchens between you. The kitchens seem really small in Preseli tbh, and if you've got an offer you can apply for accommodation now without accepting the offer outright which I would definitely recommend because they go fast. Not sure how accurate these floor plans are because I'm not at the uni yet, but its pretty much all the research I've been able to do.