Looking for an en suite room in London

I'm looking for a single or double en suite room in London or south coast of England to rent for a minimum of 6 months to 1 year.

I'm full-time professional working in scientific publications and am looking to move after spending 3 years living in North London. I'm working from home most of the week with occasional non-mandatory office-based work (once per week usually - office based in South London) and am looking for a self-contained and quiet accommodation that is suitable for remote working.

I'm looking for a bright room with lots of natural light and good sense of space. I'd appreciate a flatmate/live-in landlord who is respectful of private/personal boundaries and values keeping the shared spaces clean and tidy.