I was 8 nighs with a colleague and the conclusion was an excelent compensation for our money.
The room is small but very confortable. The toilette is bigger than our expectation for the category. The neighborhood is very quite and safe.
The remarcable points was the breakfast and the attention.

I stayed here 3 nights in early November. I chose the pension for its proximity to Koln Messe, where I was attending the World Cyber Games. Their rates are quite reasonable, but I think that I would prefer to stay in a hotel if I came again. I saw a very good hotel Dorint an Der Messe Koln, which I would recommend to anyone going to KolnMesse.
The pension itself is adequate – I had a double room just for me, which was good sized for Europe, with a large bathroom, and a desk for working. The pension has a very nice outdoor patio area which is quiet and peaceful. The problem is the location is in the middle of a residential (rather seedy) neighborhood – not really that close to restaurants or shopping. Koln Messe is about a 20 minute (brisk) walk, and the main pedestrian city centers and Dom are about a 30 minute walk across the river. There is market on the corner and a laundromat on the next street over. During the day walking around was fine, but I did not feel totally comfortable as a woman alone, walking around after dark.
The accommodations while very simple (rather like being in the dorms or at camp), were clean and well-maintained. However, if you like a warm room in winter - this is not the place for you. The room was chilly and slow to heat, but at least there was a very nice down comforter on the bed. Breakfast is quite good – breads, yogurt, cheese, meats, fruit, cereal and they will make you an egg on request.
There are two reasons that I would rather have a hotel. First, if one needs assistance, there is no one at the pension during the afternoon and evening hours. (You could probably call the number and get some help although I didn’t try it – you do have to be sure to check in before 10 p.m.) I had a lot of trouble one night – because it was completely dark inside and I had to get to my room on the third floor. I finally found the light switch, but its tough to find in the dark! The two gentlemen who run the pension try to be helpful and speak fairly good English. But any questions or problems have to be addressed early in the day. Second, I had to come back to the States two days early, and even if I stayed the first three days, I was charged for all 5 nights. This would have not have happened in a hotel or even a bed and breakfast in the US. So if there is any possibility of your travel plans changing, I would not recommend to stay here.