AKIHABARA | Store Information | MANDARAKE
I have only been to the MANDARAKE in Umeda and Minami Osaka, but they both had pretty open maid cafes...actually they were "mother cafes". I say "open" as they were a part of the store, so you could see what was up without actually sitting down, and the priced looked pretty reasonable. I bet the one in Akihabara has one, too. Those places can be really expensive if you are not careful.