Here is a list of maps I use or recommend.
Dead or Alive 5 Gym Map: The map I used in quite a few renders involving a gym.
Modernist House: A futuristic modern and minimalist house set in the woods. Possibly inspired by futuristic Japanese architecture.
Luis_Apartment: One of many studio apartment maps I use.
GTA V Online Apartment.jpg: A big GTA V map. This map has about 3 apartments, with hallways connecting the three & and elevator. There is a Garage at the bottom of the map.
SFM_CityHouse: A modern studio apartment set in the city. The colourscheme is very... WHITE!
GM_Studio_Apartment: Another Studio apartment sent in a city/town environment. This time more vintage or classical in appearance, with old, peeling wallpaper as per Half-Life graphics.