I'm sure they often did meet in homes, not necessarily by choice. But the church in Corinth did meet together on a regular basis. 'When you come together as a church.' ( 1 Cor. 11:18). I assume that they met in a hall somewhere as the Ephesian believers did (Acts 19:9). When they became too large for the hall, they seem to have planted a church in Cenchrea, one of the ports of Corinth (Rom. 16:1).
The idea that all 1st Century churches were exclusively house churches does not commend itself to me. I doubt that many houses were big enough.
The church was an assembly of called out believers, gathered as a family of God. So it makes sense that they would meet in homes. Homes would be safer than in a hall or a designated church building, as persecution raged.
The church in a city like Ephesus could assemble in several different homes, not necessarily one large facility.
Romans 16
3Greet Priscilla and Aquila, my fellow workers in Christ Jesus, 4who have risked their lives for me. Not only I but all the churches of the Gentiles are grateful to them. 5Greet also the church that meets at their house.
I am not convinced that the lecture hall or school of Tyrannus served as a location for the worship and fellowship of the church assembly. It seems to be a place where Paul gave speeches, possibly training pastors and evangelists.
Acts 19:9
But when some of them stubbornly refused to believe and publicly maligned the Way, Paul took his disciples and left the synagogue to conduct daily discussions in the lecture hall of Tyrannus.