Depends on location, but doesn't sound like a big job to me and I'll assume it's within an hour distance or you might have pointed it out. 6 stairs is nothing and an EM will present no hassles with narrow doorways etc.
I'd tack on at least $100 for your trouble, $200 if you wanna get greedy. I don't really get charging by the mile as you aren't UHAUL just figure out something that works.