What does apt/suite mean
These are 2 different types of addresses for a main building. Apt is short for apartment. They both can mean the same thing though.
Apt means apartment and suite means the room that you are staying in of you're in a hotel.
Apt/suite means an apartment/suite. In hotel reference, a suite refers to a 2-rooom deluxe unit and an apartment is bigger and can hold more people for instance a family. However, the terms can also be used interchangeably.