Yes there are seats up there for transportation of staff. If you think about it....on a normal 747 there are stairs...i don't think there are stairs on a 747F, just a ladder....the pilots have to get up there some how...I think if there were stairs, there wouldn't be room to front load cargo
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Photo © Jason Rossow
Or, the upperdeck door is opened...but i believe they enter from the normal door...see the air stairs there...
Have a look at some more pics....just do a search, 747/cargo....answers a lot of my questions!!
P.S. Happy searching!