Britain in general and London in particular places expensive enough. The hotel is searched and reserved through the Internet. If be going to remain in hotel more than 3-4 days, glance on a site of the hotel or competing sites of systems of booking – it is not excluded that somewhere the prices can be more low.

Hostels is some kind of accommodationin which another's people, travellers, live in one room.
Absolutely normal situation if a room mixed, that is women and men spend the night in one room. However, practical hostels in which I stopped, rooms with separate settlement – separately for boys and for girls had all also. In big hostelah there are also rooms for two and even on one person. Quantity of berths in a room in hostele usually from 4 to 8.