William,
I really don't think there is a problem Staying at your ladies place these days. If you want to play safe, just register at a cheap hotel for the first night, and everyone's happy!!...lol!! I've known more than a few that have gone straight to there girlfriends apartment on arrival from the airport. If i'm not mistaken, i believe BigButt did on his last visit, to his fiancee in Changsha before he was married!!
This was a bit of a problem in the past Will, but things have opened up so much now, and foreigners can now move about China pretty much as they please. In the past they were required to register at a police station if they moved/stayed in another city than they first registered for more than 48 hrs. That is no-longer a requirement, and hasn't been for a good few years now!!
Now, if your lady is prepared to have you stay at her apartment, that is a hell of a good start for you. That is showing you, that she has a lot of confidence in you.... And no-way are you talking to a translator...lol!!
Let's just say, your starting off on your journey/first visit in a far far better position than most have experienced here, so make the most of it. Be aware, that she is putting a lot of trust in you, appreciate it, don't take it for granted.... all the best to you William
David......