I'd thoroughly recommend staying here. Don't worry about the fact that you're sharing a bathroom and that the individual rooms don't have locks. We left all of our stuff there and didn't have any problems whatsoever, and as another reviewer said the bathroom is kept spotless.
We were very pleasantly surprised by Di and Paul's guest house. As soon as we walked through the door we were made to feel very welcome, given a tour and then shown to our room which was very clean, spacious and lovely and warm!
Breakfast was amazing. Di makes her own muesli, jam and marmalade and left us feeling very satisfied after a huge, but also extremely healthy breakfast. The city centre (and station) are an easy walk, even with bags.
Choosing to stay with Di and Paul made our weekend that bit more happy and relaxing. We will be back! :-)