I stayed at Joe's place for 4 weeks while working a travel nursing contract. The apartment is comfortable and well-equipped. The bed is comfortable, and the kitchen has everything you need. The location is a 5-10 minute walk from Newark Penn Station, easy access to Manhattan via NJ Transit and PATH trains.
I would absolutely stay here again, would only offer 2 warnings. These are not reasons to avoid this place, but just what a visitor should know ahead of time.
First, as others have noted, it is noisy, lots of traffic and buses and people. Even in the middle of the night, trucks make deliveries at 4am and it's loud.
Second, parking is a nightmare. On event nights (several nights a week when there is a hockey game or other event at the nearby Prudential Center), streets are closed off and even parking on the street is $25. If you don't have a car, this will not affect you.
Again these are not criticisms of the place, just what a person should know ahead of time.