Renting property in London or anywhere else for that matter is never fun to do. Most people will end up renting a property at some point in their lives whether they are young or working to save for a deposit for a mortgage.
By searching the property early enough you give yourself time to find a property where you will be pleased with the well as the property itself, regional or flatmates if you are looking for the stock. You can also look for the flat rental agents in London for renting a property.
If you move to another city it is best to look into visiting a new city to look flat in advance so you do not have the added stress when moving and had to stay in hostels or flats poor. If you want to find an apartment London it would be difficult with it being a student, if you look at the students to see in August where possible
Plan in advance what you need to check before you look at the property. Make sure you see the state of all the rooms, asking if he has central heating, a washing machine, and dishwasher. Is there double glazing if not how a standard window? Heating bills may be astronomical if you have a window with a gap.
These things can be forgotten at the time so make sure you write these questions down in advance and bring them with you for each property.