nothing really - beside the wifi as mentioned; overpriced breakfast maybe - but I have not taken it anyway, there are several bakeries and cafes just a few steps away, where you can organize your breakfast
great location in the old town, I did not even use public transport - walked arround - even to university which is not just behind the corner (the weather allowed...). Several parking houses arround (12.50 € per day) if you arrive by car. The whole experience has been interesting - starting with filling a form in the pub, with all my luggage hanging from me and the big thing on the floor (and even needed to search for glasses because the form using font size about 6, in a dark pub) - and on the part of the pub where the waitresses received the beer to be taken to guests, in the middle of the Germany : Spain football match on several TV screen loundly supporting the tension among the guests... :) but they (the staff) have all been kind and helpful. have got a room at the top floor - there are some steep steps, but unless you have problems with health or similar, not a problem really - after all it is an old building in the old town. Going out for the first time wanted to switch the lights on in the stairway - and a strange sounding device started to operate . realized that I was opening automatic roof windows :)
ok admit, I join the line of complaints about wifi - knew about the problem in advance, reading the reviews, and thought I will not care about this. But when I needed to check the opening times of certain institutions, and even to read my colleague's email with guidelines how to find his office - I realized how much we depend on this technology today - so after so many complaints the management of the hotel could do something about this - it is just a couple of euros?
accept the steep steps as a way to a room with less noise from the pub below! so ask for the top floor.