I stay at the Jersey City Hyatt quite often. The standard rooms are a fair bit nicer than most of the comparable Manhattan hotels, and some have fantastic views of the Manhattan skyline (Note: try for a room on an upper floor facing east or south for the best views, IMO).
I've stayed in one suite, which was approx. 1200 sq. ft., with a full living room and dining room, 2.5 bathrooms, and a full-size bedroom. Definitely worth the use of a suite upgrade cert, if you have one!
The only downside from my point of view is the late-night transport to/from Manhattan. The ferry service is great during the day, but if you plan on staying in the city for a nice dinner or a show, you'll have to take a (pricey) cab back to the Hyatt.
Enjoy,
-Zombie-