Black-brown Shelving unit, 2 tier, IKEA Kalax.
In excellent condition and with instructions included.
Can use free standing as depicted in 1st photo, or affix to the wall (last photo, IKEA's suggestion).
Pick up in person near Tooting Bec/Balham.
Note: flat is on the 4th floor, and there is a lift, but it occasionally breaks, so can't know if it'll be working in advance.