If you are looking for cheap staying in London, I would highly recommend you to stay by Jenny. I am not really sure about long term staying, but for week or maybe two it is the great deal, really. There are all needed amenities inside, very friendly spanish neighbours and comfortable location. Someone told me before my trip that Brixton is not the best district but I will confidently disagree with that statement. Yep, it is multi national, but I ve met a buch of nice and pretty people. Also, despite the fact it was -4C at night during my stay, my appartements was still warm and comfortable. Other words, I don't think you'll fnd something cheaper with that kind of quality.