Our bottom line: We would happily stay there again.
The unit was as advertised (yay!). Everything worked. Nothing looked worn or shabby. Plenty of room to live outside of our suitcases for a week or more. Street-level front door. Decent sized bathroom and a shower big enough to turn around in. Actual windows, even though there is nothing to see from them but fence (which also means privacy). Good mattress for us. Roomy enough for the two of us not to feel claustrophobic at all for our weeklong stay. A real door separting the kitchen/living area from the bedroom and bathroom. Also a separate small entry vestibule for leaving shoes/coats/etc. We liked their no-street-shoes-in-the-unit policy; the floors are generally hard, so you might want to bring slippers. Neighborhood felt safe.
This unit is not a palace, but that was not our criterion. The 'living/sitting' area section is a bit awkward; placement of coffee table jockeys with avoiding the door to the bedroom and any legroom between the sofa and the table itself. The one caution I would emphasize, which the owners already make clear, is that tall people may find the unit a challenge. Low ceilings especially in part of the kitchen area and in the shower. For people like me and my wife (I'm tallest at 5'10") it was not a problem at all.
Lastly, and this has nothing to do with the unit and everything to do with Jersey City, if you have your own car and are street parking, (a) our experience is that street parking can be difficult to find, but if you're patient you 'll eventually find a spot somewhere in the area, and (b) streetsweepers come by a couple times a week - days and times posted on each street segment - and you must move your vehicle to allow the sweeper to come through.