Sink
We used a sink that's 13" x 13" on the interior with an 8" depth. This size seemed to be perfect, doesn't take up too much space, yet is deep and big enough that we can easily wash pots/pans in it.
This is the sink we bought: MENATT 15 x 17 Inch Drop in Kitchen Sink, 18 Gauge Stainless Steel Single Bowl Single Faucet Hole Topmount Kitchen Bar Sink or Prep Sink (Black).