You need to study more about property.

Those are service residence units of the hotel building. They are units owned by individual buyers and normally are above the hotel units.

These units ARE NOT serviced by the hotels staff. They are allowed to use the same facilities in the hotel building but the hotel cleaners, bellboy and receptionist/concierge does not form part and parcel of your unit bought, meaning to say they will not do housekeeping for you or handle airBnB for you.

However, there are some that allows you to do pay-per clean service, meaning to say they will help you to do housekeeping if you request and they will charge you a fee each time they clean for you (and it is normally more expensive than you getting a part time maid).

For any other service apartment that are not built on a hotel building, they function just like a condo except they have either a mall/shops on the lower ground floor or within close proximity. They are allowed to convert their utilities to residential rate.

The maintenance costs are like condo, which is to pay for security, facilities maintenance etc.