Contractors! What makes a good client?

[Jonathan R McLaughlin]

So engaged in a rehab project now. Its a new area for us, and so far we have had good luck finding great guys from referrals and just reaching out for quotes etc. Knock on wood its going fast and well. Fingers crossed. We are doing a lot of the logistical coordinating and I want to get better at it. 

Experienced contractors, I'd love to hear from your perspective what makes for a good client in these situations? Some things seem obvious--like pay on time-but any advice you give is welcome. BP is a great place to hear about problems, but what things prevent them?

Little things we have noticed:

1) use good people throughout...people seem to know each other and seem to want to do good work for people they respect and keep their deadlines

2) respecting time--we have asked a few people if they could give us an estimate and offered to pay for their time to do so. So far everyone has declined but they seem to appreciate it

3) instead of saying "whats the cheapest way" asking "whats the most appropriate way to do it?--"is there a way to keep it in this X budget?"

4) asking about other jobs and being flexible on schedule breaks to accommodate

5) being onsite a lot (this could go either way!)