holiday apartment; vacation condo
A privately owned apartment in a resort area, used as a second home for holidays. Often part of a larger condominium building with shared facilities.
wasei-eigo (Japanese-coined English), from resort mansion
See also: マンション
We always spend summers at our holiday apartment in Karuizawa.
holiday rental apartment (members-only)
A resort apartment rented out through a membership-based agency, not open to the general public. Often used for short-term stays.
I booked a holiday rental apartment through a members-only agency.