I stayed in Sylwia's apt for 5 nights with a friend. Sylwia is a nice person (I recommend her pick-up service if you arrive at Newark airport) who brought another bedcloth on short notice. The apt is clean and nice.
The surroundings are not elegant but ok, and we (2 women) never felt uncomfortable even when arriving in the dark. It was not my first stay in the US so I knew what to expect. For someone who visits the first time (from Europe) the surroundings might be irritating at first.
Going to Manhattan takes more time than Sylwia says in her discription. Though from October 2012 on the rail system offers 7-day-passes, so one can save some money going to Manhattan.
If you are looking for a clean and spacey apt for a reasonable price and have enough time to include the walk and ride to Manhattan this is the right place to stay.