It really depends on the job specification.
The best thing to do is meet him, ask lots of questions and pick his brains.
Find out about time constraints, signing work off after completion, payment terms, you will get the feel as you go through the meeting.
On your pricing make sure you allow extra time to do the work throughly as builders cleans are nearly always labour intensive. Don't price yourself cheap as it will come back and haunt you!!
Best wishes,
Trev