This place has both astoundingly good reviews and a gallery, apparently. According to the website, it's run by "Annie, a well-known celebrity on the Street Art scene".
I may have to pop in at some point, though I'm rarely at a loose end in this bit of town.
I couldn't find out why it's called the Rope Walk, but it does seem to be the starting point for the Blood and Butchery in Bedminster walking tour, so that might be a way of finding a local historian who knows...
GPS Coordinates:
51.44480, -2.59238
Location: Bedminster East
