Hotel was convenient to central Hamburg, either 15 minute walk from Hauptbahnhof or 1 stop on U-bahn. Steindamm has lots of convenient grocery stores, altho it can be a seedy closer to the Hauptbahnhof. Lange Reihe, the other main drag in St. Georg is only 2 blocks away, with lots of good restaurants.
The Motel One "thing" is to have the living room/pantry in the lobby and your room is your bedroom. Personally, I miss having a kettle in the room to make a quick cup of tea. The beds are comfortable but if Motel One wants to make the rooms even more efficient, they should think about drop down tables and fold away chairs.
The EUR 9.50 breakfast might sound like a bargain until you see everyone jammed in the lobby lounge balancing small plates on their knees and trying not to bump into the person sitting next to them. Seriously folks, you can spend the same money in more comfortable cafes outside.