mikliz97, the report is undeniably correct and accurate because it was conducted by Germans and it is on the internet. So, there is no room for doubt. Well of course not. These things are great to open your mind and make you think or give some direction for further exploration. I stop at that point.
This study compares restaurants costs and hotel costs per country. How in the world do you do that? For example, if you were to take the average cost of all hotels in Prague it might be about the same as in Budapest. But if you were to compare those in comparable locations for tourism, Budapest may come out a lot less expensive. And even that is incredibly subjective, how do you quantify the similarity of the location? Well, you can’t. But to compound the problem, this study speaks to countries, not cities. Take a country like the Czech Republic. The overwhelming majority of tourists only see Prague. Prague is probably significantly more expensive than the rest of the country so the country average may have limited validity.
The Norway vs Denmark debate is interesting. A different study, one of cost of living not tourism, says that Cost of living in Denmark is, on average, 17.9% higher than in United Kingdom while the cost of living in Norway is, on average, 25.1% higher than in United Kingdom. (for a similar baseline, the study also says the cost of living in Germany is, on average, 2.4% higher than in United Kingdom). For the numbers to flip, and get so close to each other, for tourism something pretty substantially different would need to exist in the tourism market; and it may. Don’t know.
So, as a tool to get started, maybe the report is okay. For “fact” probably not. The only fact will be once you plan your trip in location A and then in location B and you compare. Socrates: "The man who asks a question is a ...."