Free advice below!!
Once you had enough of youth hostels, you may want to consider a flat share or a house share. If you are planning to stay in London for a long term (from one to six months or more), it will be worth moving into a rented/leased long term accommodation.
Fortunately there is an abundance of places to rent in London, but be prepared to pay! Most places come fully furnished which is a bonus to those arriving with nothing but their clothes. Depending on what part of London you are in, the prices can vary, but the closer you get to Central London the more expensive it gets.

