It's certainly a nice thing to be able to travel and visit other cultures and countries. But the advent of massive international transportation combined with few tourism hotspots has created a tourism industry that can outprice locals, and thus destroy the cultures that created the artefacts they show to tourists.
Right to live where you work seems to be a good one.
temporary visitors.
If we generalise the "live where you work" to "stay where you spend most of your time, then it makes a lot of sense for the visitors to be housed in the centre. Otherwise you force a large amount of commuting on them. For course that doesn't matter much for each individual visitor because they are around only for a short time, but that's not the right metric. It means that Berlin's infrastructure is heavily taxed with all that unnecessary commuting by (every changing) visitors.
The thing is, it completely reverses the meaning of my point, which was based on concern priority, not transportation efficiency. To me, it seems important that people whose home, job and lifestyle/culture is at stake are treated preferably to people for whom the city is just a tmporary leisure.
By making sure that visitors don't effect too much locals, we also promote a kind of tourism which promotes hospitality, and which ensures that the object of visits is not destroyed by tourism consumption.
Indeed, the boundary between tourists and residents is porous. Capital cities attract a transient population from week end visitors to interns or workers who stay a few weeks, to summer visitors who stay a season, to students who stay for a few years, to proper residents who stay a decade or more. All of them are a source of ideas as well as a source of income for Berlin's industry. "Das ist auch gut so." Hence Berlin needs to cater for all. That includes providing substantial, centrally located living space (whether hotels or apartments) for short-term visitors.