In terms of location, the place is definitely situated within an easy walking distance to the tube station as advertised. The hostess is very friendly and quite helpful. However, Clapham North is not very central.
Frankly speaking, my general experience is disappointing. I've paid £40, so, frankly speaking, I was expecting a more decent accommodation even in London (especially not-so-central area as I just described). Though the house was pretty acceptable, and the room itself was kept quite clean, the entire house is relatively old and not very elaborately furnished. Maybe it's just me and my bathroom sensitivity, but I find the bathroom and the toilet quite unsatisfactory. As I went to a boarding school before, I would get by in a place like this for a night or two, but I would expect a lower price like £25 for a place like this.
Maybe it's just during my stay, but the hostess held a party when I was there. Though she tried to keep the voice to the minimum, it's still audible. I remember getting woken up by the noise of people talking at about 4 in the morning!
To conclude, quite a let-down for me. I would say "yeah, okay" for this place if the price goes down a bit, but I wouldn't recommend this place for this rate. I suggest you find other places in greater London (since this place is on the edge of greater London).