Add punctuation: We do requier a deposit of kr 500 which you pay at the arrival
A: We do requier a deposit of kr. 500 which you pay at the arrival.

Add punctuation: Regardless of which role you choose to apply for you should be familiar with Debians procedures so it is recommended to read the Debian Policy and the Developers Reference before applying
A: Regardless of which role you choose to apply for, you should be familiar with Debian's procedures, so it is recommended to read the Debian Policy and the Developer's Reference before applying.

Add punctuation: At the 1960s villa at Fns Strandvej the waves from the sea can clearly be heard
A:
At the 1960's villa at Fns Strandvej the waves from the sea can clearly be heard.