Question: a left-luggage office ensures you can comfortably explore brussels without worrying about where to leave your belongings.
Answer: --> A left-luggage office ensures you can comfortably explore Brussels without worrying about where to leave your belongings.

Question: the apartment is cozy and quiet.
Answer: --> The apartment is cozy and quiet.

Question: these two library files are located in parallel application in the way.
Answer:
--> These two library files are located in parallel application in the way.