Potential responses for propertyType (as well as valid options for propertyType filter in /search API) are as follows, but are not limited to this list. The different types is a dynamic list that is always growing and it can also be that in your region specific types are not available.
AGRITOURISM
APARTMENT_HOTEL
APARTMENT
BEACH_HOUSE
BED_AND_BREAKFAST
BOAT
BUNGALOW
CABIN
CAMPING
CARAVAN
CASTLE
CHALET
COTTAGE
FINCA
GITE
GLAMPING
HOLIDAY_VILLAGE
HOTEL
HUT
LODGE
LOFT
LOG_CABIN
MANOR
MANSION
RARE
RIAD
ROOM
STUDIO
TENT
VACATION_APARTMENT
VACATION_HOME
VILLA