I used to shop there as a student, mainly for the second hand vinyl.
From the entrance facing the Printworks, on the right was a shop that sold bric-a-brac. I bought an old £1 note from there, still have that.
As you went through that entrance, to your right and near the 'back' was a spiral (IIRC) staircase that went downstairs to a cafe, where you could buy tea, toast, etc. It had a small seating area. Back at the top of that staircase was a second hand vinyl shop that absorbed most of my meagre part-time wages.
There was a balcony above and right the way around, I never went upstairs I think it was off-limits. You could see clear up to the ceiling. The floors were wooden floorboards or planks, varnished/oiled and polished. Many of them were badly warped, you couldn't walk through the place without them creaking and straining under your feet. The entire place smelled wooden, musty, and of course there were various 'other' smells associated with students and smoking
There were lots of clothes shops, most of them IIRC were on the right side as you entered from the front. Harry Halls cycles was just next to and on the left of that entrance, down a very narrow stone staircase and a turn left through the door.