I went to Kensington Manor Hotel four times : I have read all these reviews saying it is a terrible place and I have to disagree : You have to consider the price which is very cheap for London (a single room with shower is only 45 pounds), and the excellent location near the underground, shops and restaurants. Of course they could do with some refurbishing and the carpets are worn but I have never had any remarks about the cleanliness of bedlinen and towels. The shower and toilets in the room are always clean.
It's true that this old fashioned hotel hasnt been renovated in a zillion years. However, the size of some of the bigger rooms and it being 2 blocks away from the tube stop more than makes up for it to me. I especially love using the big grocery store right above the tube and carrying my carry-on to the Underground directly to Heathrow on my last day in London (Gloucester Road stop)