Looking for an ensuite room

28 year old woman, working full time, looking for an en-suite room or a studio flat in London, preferably less than 1h tube commute away from Chiswick.
Ideally I would like to find something close to a park as I love going for long walks in nature, not too far from shops though and close to tube station as I do not have a car.
I am friendly and clean but at home I prefer keeping to myself and I'd rather not have anyone knocking on my door unexpectedly. I do like to go out sometimes but I prefer to live in a house that is generally quiet.