We were thinking of booking a twin room on expedia for our family of two adults and one child, but we'd like to know what the size of the beds is in a twin room. Their site says 'single' but the picture shows them as quite big. We're trying to find out if we'd all comfortably fit in, or if we'd better opt for a rollaway (unfortunately at a price!). Does anyone know what the size of beds is like? Thanks.