Single room: 2 persons max. (1 standard bed + 1 extra bed), WC/bathroom and kitchen are SHARED, common on the floor
Studio (count is limited): WC/bathroom and kitchen are INSIDE the studio:
Individual studio: 2 persons max. (1 standard bed + 1 extra bed free)
Two beds studio: 3-4 persons max. (2/3 standard beds + 2/1 extra beds)
Dormitory:
Group: minimum 8 beds