Well, we stayed there to have a place on walking distance to the Signal Iduna Park. And yes, the location is simply perfect when you want to watch a BVB game. Another positive: the staff at the reception desk was truly friendly and very helpful indeed.
The rooms however would require a renewal, a modern touch. Beds are comfortable, but the design, furniture and colours are simply not up-to-date anymore, and the bathroom is very tiny. Price is too high for what you get, probably especially on Bundesliga weekends and considering that (at the moment) you share a view to a construction site (at least windows are good, you don't hear anything). It feels a bit like staying at a "cash cow" of a hotel chain.