This is the quantity of this room type.
If your rooms are similar and have the same rates you may use this setting to create the required number of rooms. Bookings will be accepted for up to this many rooms per night and then shown as unavailable.
Alternatively you may enter each room separately, each with a quantity of one. This way bookings will be uniquely assigned and can be transferred to individual rooms.
When using the Room Type = 1 Room per Guest this quantity sets the maximum number of guests for this room. This may represent beds in a hostel room or per person activity tickets etc.
