Hotels near Mauerpark

It was my first time arrival in Berlin, I expected some hospitality from locals especially in the place where I will be staying. I didn't expect that much in this hotel, due to its price which is quite low. When I arrived at the receptionist table, she isn't as polite and helpful as she suppose to be. After waiting for 20 minutes, she gave us a key card to a private room for 2 person with a private bedroom. Guess what? When I open the door there was a g*d**m guy sleeping in that room! What kind of receptionist that gave us a key to an occupied room? We go back to the receptionist table where she gave us a different key for another room. Instead of having the right room as we ordered, she gave us a room for 6 people yet luckily nobody else gets in that room. That night was raining and the windows was opened so there's some water in the room. Thank God we could sleep for some hours. Then in the morning all of a sudden, a cleaning service came in our room before we check out and speaking in German (which we didn't understand entirely) and telling us to check out at that time. We ignored her since didn't understand what she says and we are suppose to check out an hour later, she bangs the door and leave. To anyone who travels to Berlin, don't you ever stay in this hotel unless you are ran out of money and no other choice. Stay for one night only, and fine another place. Period.