This hotel was ok for an overnight stay on route to another destination. It felt like a travel lodge, no atmosphere, servicable, reception staff were miserable. The position was ok for the paedestrianised areas of Bonn. Book a parking place in advance if you have a car.
Bonn was not sure what it was for me, there is a huge mix of new and old, not matched very well. The town planners do not seem to have put much thought into rebuilding the city after the war. The emphasis is heavily based around the classical music scene although the theatre is hideous!
It was an expensive city and you would really need to plan what you wanted to see before you got there otherwise you could wander around a miss the gems of the town quite easily.

A friend and I needed a place to stay for one night in January in Bonn. We looked on hostels.com before we headed there and the Hotel Aigner was listed on their website so we wrote down their information. We just showed up on arrival and the staff was very nice. We got a room for two with twin beds. The room was really spacious for Europe and the beds were really comfortable. The bathroom was really nice and clean and also pretty spacious. It was really quiet in the hotel so we had a peaceful stay. The best part was that they had a pants presser in the room. It was probably the most unusual thing I have ever seen in a budget hotel, but in a good way.