Let me say firstly that what this apparent has going for is the location witch is fantastic.
How ever, it is not realy for 4 adults, specifically if they are traveling 2 + 2.
One bedroom is fine,
Second bedrom would be fine if you are 130cm and 30kg.
There are some smaller details that could be fixed easily, like perhaps have wine glasses, plates for 4 people, and other details.
But the location is where this apparment shines.