List - The greatest one-location-movies of all time
https://thefilmstage.com/features/the-greatest-one-location-movies-of-all-time/3/
More films:
Roman Polanski's "Knife in the Water" (3 people, 1 boat), "Venus in Fur" (2 people, 1 theatre), "Cul-de-Sac" (4 people, 1 castle), "Carnage" (4 people, 1 appartment), "What ?" (many people, 1 villa at the sea)...Romuald Karmakar's "The Deathmaker" ['Kammerspiel' film], Hitchcock's "Dial M for Murder", Friedkin's "Bug" is mostly in 1 room, too. All great !
I quite liked "Buried".
"The Man from Earth" I think is terrific and "Coherence" is quite solid too.