Summer research

Hi there, I am looking for place to stay during the summer to accomplish my work in London. As I will also travel during this time I need a place where I can have access easily to different transportation options and to not disturb people from the house when coming and leaving the place. Usually leaving afternoon or very early morning and coming back late at night. A single decent room will do the job, don’t have to be fancy but at least the bathroom to be well maintained and looked after.