My new apartment has no 3 prong plugs with ground

You have an advantage over the rest of us. The screw in fuses are better quality than the cheap metal they use in the circuit breakers and by floating the ground on your equipment you will most likely get better sound. The real challenge will be the room itself.

Ejs811, Look at your electrical panel. Sometimes it will state the capacity of your electrical service. Or, you can set up your gear and not worry about it. The only thing possibly drawing a lot of current is your amplifier and it depends on the load presented by your speakers and the volume you listen at. I would not count on your landlord rewiring any time soon.