External developer dreamhost account access



I have recently hired someone through Odesk to do some development for me (a simple web scrap for getting info from 2 different websites).

He offered me to install it on my server and make sure it is working well. It would be a great help for me, but…

Is it OK to let him have access to my account? Is there any way to do it with safety?

Although he seems to be OK, with good reviews, is there any risk on doing that?

I have a VPS account in dreamhost and know some programming but have never done web development before…

Sorry if this question seems stupid…

Thanks in advance for any help!