For this project, I've learned how to turn wallpapers photos into seamless textures (in GIMP).
More content of this project: http://mapper720.ru/renders/lebfl.html
Initially, the flat was very empty and I had to create some small details assets like tableware, bathroom equipment, food etc.). Some of them are available for purchase on BlenderMarket, TurboSquid, CGTrader.
https://blendermarket.com/creators/mapper720
https://www.turbosquid.com/Search/Index.cfm?FuseAction=SEOTokenizeSearchURL&stgURlFragment=Artists/Mapper720
https://www.cgtrader.com/mapper720
Basically I used the Cycles render engine, but some things were rendered in Eevee (panoramas, the video).