A large upper room (anagaion mega). Anything above ground (gē), and particularly upstairs as here. Here and in Luk 22:12. Example in Xenophon. Jesus wishes to observe this last feast with his disciples alone, not with others as was often done. Evidently this friend of Jesus was a man who would understand.
Furnished (estrōmenon). Perfect passive participle of strōnnumi, state of readiness. “Strewed with carpets, and with couches properly spread” (Vincent).