I find the coffee at SJU AC to be the best -- it's local Puerto Rican coffee renowned for its rich taste and smoothness.

The Nespresso machines make decent coffee -- all depends on what's loaded in it. The Miami AC nespresso machine puts out pretty decent cups.

The absolute worst cup for me was at the PHX rebranded AC. Some sort of machine that requires a powder cartridge to add "cream or milk" to the cup. YUCK.