Looking for a room in a partial flat share

I'm looking for a place to stay for minimum 3 months with no current limit on tenor. Ideally I'd like a place where I have the flat to myself for the majority of the week. Thinking perhaps someone who has a flat but only uses it a couple times a week for work, for example. Appreciate it may be a bit of a unique request...but giving it a go!

Little about me...I have lived in London for just shy of 10 years now. I work in finance in the Mayfair area (please keep reading, I promise i'm not a complete ar...) and I'm in the office 5 days a week. I'm a very relaxed person, enjoy a comfortable home and always look after in cleaning wise. I have an active social life and am often out in the evenings with friends/colleagues/girlfriend.

Looking for a place as my current housemate of 5+ years has bought a place, selfishly a 1 bed...and we don't fancy topping and tailing. We think he'll be moving in October time but can be flexible.

Location wise i'm pretty easy. Anywhere within a 30 minute tube/cycle of Mayfair as I start work pretty early.