In reply to woodsy:
Worth mentioning if you're walking there from the bus on the main road that it's in a really shitty area so flashing your phone etc around might be a bad idea, particularly at night.
As for the tram, if you're travelling from anywhere in the PTE area you get free tram travel in the centre anyway. Your ticket will say "MANCHESTER CTLZ" instead of "MANCHESTER STNS" if this applies to you.
Neil