It is probably better to come here on weekends because on weekdays the place is a lot more quiet and everything is not open. The Khlong Bang Luang Floating Market, especially the Artist House, is on the program of a boat tour on the klongs which departs on Saturday and Sunday from floating market Taling Chan at 1 pm but be at least 1 hour before at the counter to be sure they are still tickets for you.
I did not check but some sources indicate that it the place is closed on Wednesday but that there would be a nice local market instead.