我住在罗马, 我生活在罗马, 我在罗马住 All of these sentences are correct, but the first two are formal, and the last is informal.

we always say 我住在罗马 for it's more popular

number one 我 住 在 罗马 can be 我 在 罗马 生活 never met 我 在 罗马 住

They all make sense if we don't pick holes from the second and third one. The second and third one sound a bit Anglicised chinese though... We would like to say 我在罗马生活，我住在罗马。

Every one is correct!!!!!!