Lovely quiet hotel, very convenient for the A5, with great amenities - properly pet friendly!
Stayed one night whilst travelling south with my pet rabbit: the pet-friendly room we were given was ENORMOUS. Lovely and comfortable, and with plenty of storage space.
Didn't try the spa because we were exhausted, but a morning trip to the fitness suite proved very productive (the available equipment was excellent).
The breakfast buffet had lots of choice, and the food quality really was top notch.
Town of Reilingen itself is lovely: we stayed on a Sunday in off-peak season, so it was even quieter, but we found a great evening meal in one of the restaurants we were recommended by reception.