Book in/check in登记住宿。

We checked in as soon as we arrived.我们一到达就登记了。

Single room/double room单人间，双人间，

We booked in advance one single room and two doubles.我们提前预订了一个单人间、两个双人间。

A two-bedded room有两张床的房间，

double decker bed/Bunk bed双层床。