Single Room Wanted for 1 Male

Looking for a place to stay in London. Recently graduated from the University of Glasgow and looking for a job while staying in London. I plan on getting a temporary job until I can land a permanent job in my field.
The room must be a single room as I don't prefer sharing a room with anyone else. I don't mind sharing bathrooms but an en-suite would be amazing (though I am aware it's not practical to expect that for my budget).
I am not a smoker so it would be nice to have a non-smoking residence but I don't particularly have any issues with smokers.
Would prefer if the rent isn't more than £600 a month
Other than that I just want to be around nice people :)