I have stayed at both Kings Center Superior and Kings Hotel First (they are sister hotels). Kings Center Superior is the better hotel with more amenities like free coffee and tea throughout the day. I would recommend Kings Center Superior over Kings Hotel First, it is more expensive but worth it.
Disadvantages about Kings Hotel First:
1. There is no amenities room on the third floor.
2. There is no laundry/dry cleaning services on weekends.
3. There is no landline phone in the rooms to call the reception.
4. There is no free coffee or tea during the day unlike its sister hotel.
Advantages:
1. Very short walk to Munich Hauptbahnhof.
2. Very short walk to many nearby groceries and supermarkets: Aldi Sud, Rewe, Lidl, Müller, Gute Lebensmittel, Edeka Ernst, etc.
3. Receptionists and managers are very welcoming and friendly.
4. Quiet and soundproof rooms.
5. Wifi is quick and reliable.
6. Bed is very comfortable and cozy.