We enjoyed our two night stay at Placemakr. There was tons of internal storage space for bags, a full size bathroom and a nice kitchenette. Laundry was also available (bring your own detergent). The location was excellent and close to the riverfront, Battery Park, Chinatown, Brooklyn Bridge, 9/11 Memorial, etc. We really liked the convenience of being able to store our luggage before and after check in.
Sometimes the messages with Placemakr are answered instantly and other times the messages are not answered. You may have to repeat a question until you get a response. However, the front staff (in person) were very helpful and answered all my questions. For example, I requested a travel crib prior to booking and confirmed the availability of the travel crib before arriving. Upon arrival, there wasn't a crib in the unit and I had to ask the front desk for it. It took a little bit of time, but the crib was delivered.