I spent one month in Halpin House, and I was in a single room. The cost for the singe room is crazy compared to the services offered. The place is quite dirty, most of the people don't clean the kitchen after using it, and leave a colorful dirty mess. On the 4th floor, where I was staying, there are 5 showers. Just one of those works properly. Even if at the reception they know the problem, nobody has never done anything to solve it.
His place is more for long term staying, so if you are a young guy that looks forward to find people of the same age to get out with, forget Halpin House.
The strength of this place is the position. Kensington is a really nice area in London, close to V&A Museum and Natural History Museum, and most important, halfway between Gloucester Road station and South Kensington Station, both on the Piccadilly Line.
I would recommend not to spend more than one month in here, since general conditions of the structure are quite weak.More