Sylwia's house is extremely clean and well maintained. However, I am so surprised that not many reviews mention about the shady neighbourhood the house is located in.
Moreover, the access is not that easy. We had to take taxis everyday to and fro the Newport path station (costing approx 12 dollars).
The area was really run down and seemed unsafe, so taking the light rail from the path was out of question as we didn't want to walk around the neighbourhood.
If you can up your budget and get something closer to the path station I would definitely recommend doing that. We shortened our stay here and moved to a hotel in NYC.
If you do stay here please don't forget to carry your toiletries.
Otherwise contacting Sylwia was easy and she had ensured the keys were available even though we reached at night.