A single will usually mean one bed, most often a twin bed (unless you're staying in a very lux hotel where you might get a queen bed). You want a double room. Twin = room for 2 people, 2 twin beds. In Europe I assume a twin room to be 2 beds, 2 people; a double-- 1 bed, 2 people; a single-- 1 bed, 1 person.

In the European hotel industry, a single room (or chambre simple) is specifically designed and priced for one person. Unlike in North America, where a "standard" room usually contains one or two queen beds and can accommodate multiple people for the same price, a European single room is often significantly smaller and contains only one single twin-sized bed. These rooms are a practical solution for solo travelers looking for a lower price point, but they can be surprisingly compact, sometimes barely larger than the bed itself and a small desk. In older, historic buildings in cities like London, Paris, or Rome, single rooms might be tucked away in corners or converted attics, occasionally featuring a private but very small "en-suite" bathroom. It is important for travelers to note that if two people try to check into a "single" room, they will almost certainly be required to upgrade to a "double" or "twin" room and pay the associated price difference. For the solo traveler, however, these rooms offer a private, cost-effective sanctuary that avoids the "single supplement" fees often found in other parts of the world.