Nick - I see a nightly price of around £28-30 depending on time of year etc (for 1 guest), a weekly discount of 15% - and a maximum stay of 28 days, etc
Just one point - you call it a private room, but you seem to suggest it has it's own private entrance, bathroom, kitchen, bedroom etc. If there is no shared internal space then it is an 'entire property' which many people prefer.