Melancholy Without Hope

So I got my first interview for tomorrow.  It wasn't even one I picked; it happens a friend of my mom knew of an opening where he works.... so....

I am torn about this because:

1.  Once again it isn't really an area I am certified in.  It is an Early Learning Center and goes up to age 7; so total opposite what I'm used to as of late.
2.  Younger kids= more germs.  (yes I have issues)
3.  I just want my own 3rd, 4th or 5th grade classroom.  WHY IS THIS SO DIFFICULT?

BUT

1.  It gets me into Boston Public Schools
2.  It is like 10 mins from my house.
3. It  could be fun.
4. Given the climate in this economy, I might not get another offer, if I do get offered the position.

Suggestions?  Advice?