I used Airbnb for the first time. It was nice to stay at this room. I used it just for sleeping -> all day on Manhattan. Its quiet, small place; enough for me. But its definitely not 15mins from Manhattan. Usually i traveled 30-45mins. You have to walk about 5-10minutes, then use light rail - 10mins and then PATH - another 10mins, and you are at WTC. But everything else was fine and I can recommended this room for accommodation.
Travelers tip - from PATH station Exchange place is beautiful view, mainly on downtown Manhattan. At the evening is awesome to watch dusk.