There are four patient rooms in the Hotel Artemis: Niagara, Honolulu, Accapulco and Nice. Patients assigned to these rooms are only ever referred to by that room's name. Sterling K. Brown's character is called "Waikiki," because he shares the Honolulu room with his brother.
As seen on the official trailer, Hotel Artemis 10 rules are : 1. While on the premises, no fighting with or killing other patients. 2. No disrespectful words or actions allowed against Hotel Artemis staff. 3. No guns of any type of weapon permitted through the gates. 4. Memberships must be paid for in full and in advance. 5. Prior but lapsed members will not be admitted 6. No photography or video allowed. 7. No outside food or drink. 8. Absolutely no visitors. 9. If member is found to have compromised or led to compromise of location, membership will be revoked. 10. Hotel Artemis rules are final and non negotiable.
-To promote the film, Global Road Entertainment released a set of character posters, each featuring an homage to a famous literary or film reference from Los Angeles, such as Sterling K. Brown merged into the book cover for Raymond Chandler's novel The Long Goodbye and Charlie Day merged into the film poster for American Gigolo.
Sterling Brown, Dave Bautista & Jeffrey Goldblum all play in Marvel Cinematic Universe (MCU) movies; Brown in "The Black Panther" Bautista in the "Guardians of the Galaxy" & "Avengers Infinity War" & Goldblum in "Thor Ragnarok".
At the end, "The Nurse" refers "Waikiki" to a "dark room" in Las Vegas. Dark room is a longstanding underworld term for an emergency room or similar medical facility where criminals can go without the police finding out. The Hotel Artemis is a dark room, albeit a very elaborate one.