I really love little art spaces like this one. Kensington Art Supply recognizes their main audience pretty well - the ACAD students up the hill. So they offer a pretty good student discount, and have all the things a student might need.
The staff know their stuff, and they are always helpful and never snotty. I appreciate that in an art store. They have a good selection of brushes, oils, pastels, pencil crayons and pencils - I noticed they mostly focus on items for the visual artist.