We reserved a room for two with one double bed and a sofa-bed. Before we left, I called the number on our confirmation email and made sure our keys would be waiting on the airport. The lady at the desk at the other end of the line also offered to send us directions to the desk at Schipol.
When we collected the keys, the receptionist told us that we actually had an upgrade to our room free of charge! The room was newly renovated, and came with a double bed and a sofa-bed, so it was perfect for us. After paying the 300€ security deposit, we were on our way.
The apartment suites are located about 10 min. from the central train station to the left, or southeast. Don't be confused by Google Maps, which might show the apartments to be in Zaandam, farther from the city. That's just the same address, not the actual apartments. The kitchen came with pots, a coffee machine and water boiler, accompanied by plates and flatware. We didn't use them that much on our short visit, but there was potential for a more serious food-making with whisks and other kitchen utensils. The food was easily bought from a nearby supermarket.
The bathroom was good, although it didn't seem to dry that quickly. Air conditioning was probably the biggest issue we had with the room, the air was fresh all the time, but it just wasn't the temperature we would've wanted.
All in all, for the price we paid, I cannot recommend PH Apartments enough. From the check-in to check-out, everything worked.