Congrats on your interview. I to am being interviewed on Jan 4th but for In-Flight Beauty Therapist!
I have been looking at transport/accommodation and have found out that the nearest train station is Gatwick and the Premier Travel Inn Gatwick Central is within walking distance from the station and a budget accommodation option. Alternatively there appears to be a range of smaller B&B/Guest Houses in Crawley.
I hope this helps with your planning!