I've never measured the porches, but the OKW porch on the one and 2 bedroom units are big enough that they have a round table at least 3 feet in diameter, with 4 chairs. Even with people sitting in all the chairs, you can still walk around the table comfortably.
The 2 bedroom unit we stayed in at VWL had 2 balconies that were each just large enough for 2 chairs and a small (about 12 inch diameter) side table. The balconies were longer than the space needed for 2 chairs, but not a whole lot wider.