House Churches in the 2nd Century

Ben Witherington, in his response to Frank Viola's book: Reimagining Church notes the following:

we have clear archaeological evidence now in regard to houses being altered into church buildings already in the second century in the house of Peter in Capernaum (indeed, this may have transpired beginning in the first century), and we have further evidence of church structures in Jordan, and in Rome, some in the catacombs from before the third century A.D.

Is this accurate? I sure it is, but I've never heard of this before. If so, does anyone know where we may find out more about this?