Free parking at the hotel in downtown Bremen is nice, reception opens to very nice lobby, great and helpful staff, rooms were very nice. We didn't use the wellness area, but were told by others that it is great too. The Park Hotel is, as its name indicates, located in a larger park, the Buergerpark, which is very nice for strolls. It is 10 minutes walking to the main train station (and another 15 minutes to get to the downtown area.
Also, Wifi with good reception is included - as i would expect nowadays.
Bonus for dog companions is that you can bring your dog - not sure what to do, but we saw lots of people with their pooches staying there.