Rental Type for attached newly constructed apartment

Hello. I am having trouble deciding which type of property I have. It is a newly constructed, from the ground up, apartment that is attached to our main house with a separate private entrance. We have never personally used it. It has been 100% used as a short term rental since the project completion in 2024. I’m not sure if I should call it a single family house or a duplex where we live in one side or a vacation rental even though it doesn’t have any personal use days. I know shared expenses with the side of the house that we live in have to be allocated. What type of rental residence is this?