We didn't meet Sylwia, but she was quick to reply to emailed questions and her directions were good. We did meet her mum, who was sweet.
The place is exactly as it appears in the pix, although 'big room' is always going to be relative to expectations. It was clean enough, and the ensuite bathroom was fine.
The shared kitchen was ok for snacks, but the seats at the bar bench were a tight squeeze, and a chopping board and a sharp knife would have made cooking dinner a bit easier - but we may be unusual in wanting to eat in from time to time.
The ac does go off at night, and every now and then a pipe just outside the bedroom started dripping onto the remains of building rubbish - so loud it woke us every night.
The station to NYC is a wee walk away, but then it really is just minutes to the World Trade Center - although note that this is by the PATH train system and you have to buy another ride to travel on Manhattan's subway.
That all said, Jersey City was always going to be a budget option, which is what attracted us in the first place, and we were not disappointed.
What did surprise us was what a funky neighborhood we found. Grove Street always seemed to have something happening, from markets to concerts, and the mixture of races and languages in the area was a joy. We never felt uncomfortable at any time of day.
Cool neighborhood, budget accommodation with very minor negatives.