We recently returned from the Viking Mars and were surprised to find a door to the veranda as opposed to a sliding door, which we had in the past, and expected this time! After speaking with Guest Relations, and stating this is not what we had on our previous ocean cruise I realized that this time we were in a PV3 and the previous cruise in a PV2. We were told "all" PV3 cabins had a single door and all others had a sliding door. As we walked the ship we noted mostly sliders but did notice the door in the PV3 locations. Now we know for our next Viking Ocean trip!