The food and tap water supply in Luxembourg is perfectly fine and the country's healthcare system is first class. The climate is average even though the summers can get hot. However these temperatures rarely rise much above 30°C.
In many surveys, Luxembourg has been named "safest country in the world"; if you follow usual precautions, you should be fine. The area around the city centre station is a little dubious; you will encounter people panhandling. There are also some dubious nightclubs in this area that visitors should stay clear of.
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