There are two things I've noticed about the sims 4. The vacation rental system and the residential rental system demonstrate that the coding exist to implement a hotel system. I believe these would be the essential features needed to release a hotel stuff pack:
1. Hotel lot type that can be placed as a community lot or purchased using the ownable business system.
2. Employee management system for hotel employees. Employee roles would include: a receptionist to take bookings on - site (bookings can also be made via phone or computer like other vacation rentals), caterer/chef for an internal restaurant/ room service system, maid, and optional roles for bartender, massage therapist, and personal trainer to allow lot customization with bar, spa, and gym features.
3. A money management system (similar to the retail system) that allows owned businesses to earn an income from NPC use of services and unowned businesses to charge played households/NPCs for use of services.
4. Rental system that works like the vacation rental system, only it should better incorporate the features of a hotel.
5. Buildbuy items to customize the lot and create different styles of hotels from motels to resorts.
6. CAS items such as employee uniforms and vacation items for household members (including pets).
7. New activities such as: shuffleboard and water polo.