Choosing Accommodation in London
If you want to save money then the best approach is calling any friends that already live in London. Even if they don't have a place to stay, they may have other friends that can help you by offering a couch to sleep on which will do you when you first arrive and give you time to find a more permanent residence. Not only will you save money that will help with the deposit for your first flat but there is also the chance of making new friends. It can be difficult for many people to adjust to a new location so it can be comforting to make new friends quickly.
The second option is staying at a hostel which for London will be in the region of 80-100 per week to share a room with around 3 or 4 other people. Hostels can be off putting for many people, sharing a sleeping area with strangers and little in the way of privacy plus you have to be very careful with your belongings however there are a another great way to meet new people who will be the same boat as you are, London newbies. It gives you the chance to experience London with other people and makes for a more interesting time.
If you don't move into a flat pretty much immediately you will after a certain time kipping on the couch or can no longer put up with living in a dorm. The key to finding the best flat is research. Use the internet to look for London apartments for rent and take into consideration the commute, if you are moving for work, as it can be hell getting across London in the morning. Again use map sites and other information to look at the best regions to rent London property for you. You can often arrange for quite a few viewings for flats for rent London before you arrive which will hopefully help you find a flat sooner.