Houses or apartments in Luxembourg are very expensive, I bought my house for 450.000€ in 2008, and I sold my 11 year old apartment of 85 square meters for 230.000. I was quite lucky, as I bought the apartment in 1997, and it was 5.350.000 luxembourgish franks, which are 133.750€, so basically in just over 10 years, I got 100.000€ more back than I paid for it, perfect investment. Prices were increasing very fast here, and still are.

You can always check out this site http://www.athome.lu/buy/house for some information about house or apartment prices in Luxembourg.