"In these cafés, waitresses dressed in maid costumes act as servants, and treat customers as masters (and mistresses) in a private home, rather than as café patrons."
Congratulations- for whatever strange shenanigans, you've ended up working at a maid and/or butler cafe! Whether you need the cash, are doing it for shits and giggles, or Shit Just Happened, here you are. Hope you enjoy that uniform, whether it's the simple black-and-white, cosplay, or.... cat ears.
Remember your manners! Always welcome in patron as "Masters" and "Mistresses", offer wipe towels and menus at entrance, and try to drag them into spending as much money as possible. Depending on the cafe, this could mean simply food and drinks, karaoke, massages, games of all sorts, taking a (paid) picture with a patron or... going with anime tropes by slapping them in-character?
Well, some people will pay for anything.
Alternatively, maybe you're actually a patron yourself! Visiting just to say you did? Looking for a brief power trip in your life? Is this the only place where you can do paperwork for some arcane reason? Keeping an eye out for your friend who works here? No judgment, only people in cosplay who will indulge whatever nonsense is going on.
Just remember - no touching the maids or butlers, no asking for personal information, and don't be a creepy stalker. Unless you want to get in trouble, anyway.
Fill in the top level of your comment with the character's name and canon, and put in a scenario or three for people to reply to!