Harold Worthington
Google
One of my favorite places to visit in Beijing! Great for one of a kind souvenirs. As a westerner, it is good to have a local along to give knowledge of many historical or popular culture references in the art.
A few high end galleries exist, but mostly it is a collection of indie artist stores for jewelry, clothing, glass, carvings, pottery and myriad other items.
The area is huge, so you will not see everything in a single day. Just relax and see what interests you in the stores, galleries, restaurants or in the streets. It is a lot to absorb.
I had no trouble finding 798 having come by ride share and public transportation several times.
Note: prices here are higher than elsewhere in Beijing, but not outrageous. Think Sanlitun.