Ensuite wanted, mid-April/May, zone 1/2, long term

I am a 35 year old vet nurse & animal behaviour consultant, originally from Greece. I currently live in Hertfordshire, so I need to move to London for an easier commute to the clinics that I work with! I would be interested in well connected areas, like Whitechapel (E1/2), Islington/Camden, Finsbury Park. I mainly work in W1, W2, Finsbury Park, and occasionally SW.
I am able to move from mid-April, but preferably from May, and I am looking for an ensuite room. I work from home often, so I generally spend a lot of time in my room. I can be social with housemates but it does take me some time to warm up to new people! And I do really value my alone time. Happy to arrange viewings whenever convenient as I have a pretty flexible schedule currently.
My max budget (1100-1200 pcm) would ideally include bills as well.