We wanted to be near the Liberty State Park (1 mile, nice walk - then can take the ferry to Ellis Island/Statue of Liberty) so this place was perfect for us. Guy met us at the door, showed us the apartment (basement apt with window a/c that was perfectly adequate even though the weather was steamy), and most importantly told us the various options for getting to Manhattan. Guy is also very knowledgeable about Jersey City and it's history so don't be shy to ask - he was available anytime we needed him.
The Grove Street PATH station is about 1.4 miles away (also a nice walk). From there it's easy to ride to the World Train Centre or 33rd street for $2.75/person. So if you're not averse to walking, this is very convenient and inexpensive.
There were baked goods waiting for us and the full kitchen (including dishwasher!) included some basics in the cupboards (olive oil, coffee, tea, etc). Nice to be able to brew coffee first thing without having to shop.
There were a lot of travel brochures available to help plan your travels. We particularly liked the map of the Manhattan subway system and the map of Manhattan.
Overall this was a fabulous place to stay and great value for the money. We'd highly recommend it!