To be able to rent a room of this size (with its private bathroom), a big bed, spacious room, and fully equipped place (kitchen utelities, washing machine, drier..etc) and in London is a great deal.
I'd highly recommend staying a month at least to benefit from the monthly rent discount.
The neighbourhood is very quite, and the nearest tube station is 10 minutes away on foot.
I've searched for weeks for a place like this. It was a catch. Highly recommended.