Translation of bastion in German

All travel agents, but one, were all pritty unreliable as one could perceive immediately. We did not care for a dollar more or less and everybody promised the same which was not convincing.
I am learning Spanish in university but I also have to improve it for private reasons. Do you have any suggestions. It is giving me a hard time lately as it is difficult. I need to be very patient.
This moment by itself made the flight and its delay worth. Although we regarded Arequipa as a hub on the way to Chile, it turned out to be a very charming city.