I have spent a very long day trying to take stuff out again to make more space and things still need to be moved around but it's ready for me to start painting now. Unfortunately it's going to be impossible to hang anything up as the walls are rock hard. It took two of us several attempts with a hammer drill to make a hole 1cm deep. A bit of a problem for a painter, I'll have to look for some inventive system or just work on paper and use sticky tape.
I can't wait to get started next time I'm in.