We stayed in #4 on the top floor. The apartment was very nice and would be great for a small family, it was very tight quarters for 4 adults. It was a very warm weekend and there is very little airflow in the flat. The kitchen / living area only had a small vent style window, and the bedrooms only had skylights. If you tried to sleep with the skylights open then the seagulls would keep you awake, but if you closed them it was very very warm and stuffy. A few fans would've made the weekend a lot more comfortable.
The kitchen is stocked, however the toaster did not work. The electric shower had low water flow on the second day so we couldn't get hot water for 3 let alone 4 showers.
There was no place to hang towels except one hook in the small bathroom, or clothes in the one bedroom, a few hooks in each room and a over the door hook with a few hangers would be helpful.
It was a little weird to have been told after booking this apartment that we would have to bring our own towels, as none were provided. But, since we were traveling by car it was a bit easier than our usual train trip. It would be difficult for anyone traveling from abroad. A second set of keys would also have been useful, as we have 2 couples.