Hi Esser,
It appears that the key words in your original post are "apartment", "Denmark", and later on in one of your replies "so expensive".
Since you are in need of a Compressor to be used inside your apartment there are a number of Hobby or smaller Compressors that should fit the bill.
The Compressors the other guys here have suggested certainly will do the job but you keep stating that cost is too high.
Here's a Compressor selling for $120 U.S., strong enough to drive small nails.
It comes fully equipped with Regulator and Water Trap.
Senco PC1010 Portable Electric Air Compressor
The distributor says they will ship to Denmark,
If you type the words Senco PC1010 Air Compressor into your Search you will find many distributors for this product.
However several wil only ship within the U.S.
The Senco PC 1010 has been suggested here on this site several times in the past and specs indicate it should fill your requirements.
Should noise still be a factor (it produces 69 decibels) you can do as I did for my Badger 180-22 Compressor and partially enclose the unit in a padded 3 sided box.
See my post,
"Compressor Noise Reduction Solution"
--CadillacPat the UnCustomizer--