A nice and affordable apartment is located on the second floor near Westbahnhof station. If you often travel to the western region, you might want to consider staying here. A U3 metro station is nearby, and other trams and so forth are within 15 minutes of walking distance. In addition, a park, grocery store, cafe, and more can be found nearby. Luiza was extremely helpful in many ways. I received her response within a few hours and she did her best to resolve the issue. There is a spacious living room, cozy bedroom, kitchen, toilet, and shower room. Utensils are well equipped as well.
The only two issues I had were the speed of the Internet and road noise. Luiza installed a 4G Internet modem when I complained about the speed, and therefore there won't be any issue with the internet at all.
Second, road noise was unavoidable despite her best efforts. Since I have never been exposed to this level of road noise, having only lived in suburban areas and small towns all my life, and since I have a sleep disorder as well as a light sleeper, I might be too much sensitive to any noise made at night. I was very pleased with this apartment, except for the issue of road noise.
Thanks again for your help and hospitality, Luiza.