Amp problem - please advise!!

Hi! I'm brand new and hoping to get a bit of advice.

I put my old Fender Bassman in for repair and it was due to be fixsed by today but (for reasons passing explanation) isn't.

I've got gigs tonight (small pub) and tomorrow (quite big bar) and have managed to borrow a Keyboard amp from my local music store. The guy who runs the store reckons it should be powerful enough and able to handle the low end frequencies. He also reckons I should mic it up rather than DI it.

It's a Laney AH 100 .. Laney Amplification | Products | AH100

Just hoping some of you more experienced folk might have some ideas as to whether it will be okay and how best to set it up...