My girlfriend and I stayed at Pier's flat for our anniversary, this past weekend. We had no problem finding where it was once we figured out exactly where we were.
As soon as we got into the flat I couldn't help but look around and be intrigued by all the different ornaments that were positioned around the flat. This gave the flat a personality so to speak and it was rather nice.
We had no problems whatsoever during our stay and we met Pier the day we left, as he came to get the keys. He made us feel very welcome and was more than keen to chat with us and give us some tips on where to spend our time and things to do in London.
The only couple of things that may be a problem to other people is the noise that the bedroom window lets in, however Pier told us he plans to put in double glazing to rectify this.
As the flat is above/beside a record shop you will be able to hear music whilst you are in but this shouldn't be a problem if you are going to be out and about during the day.
Neither of those things affected us during our stay and I have no fault with this place whatsoever.
If you're looking for somewhere to stay in London that is both affordable and close to the tube, then this is the place for you!