I need a kosher apartment, how do you ensure this?

Most our apartments have the option to be either kosher and non-kosher.

What does this mean?    We have a set of kosher dishes and non kosher dishes. Unless it is a kosher only apartment, the kitchens are set up as default – non kosher. When a guests requests a kosher kitchen, we switch out the non kosher dishes and replace them with the kosher ones. (This done at an additional cost of $55) Appliances are not kashered, but you are welcome to do so upon arrival.