Not a bad hotel. The rooms are actually much smaller than in the photo. But it's still cozy and quiet.
4 only because of the location. The metro and the train station are nearby. The Danube is a 10-minute walk away.
The hotel is very old, and you can feel it in everything. Reception is on the 3rd floor, breakfast is on the 4th, there are no air conditioners in the common areas or in the rooms, plumbing is in an unsightly condition, breakfast is very weak. The only justification for all this can be a low price and a good location near the main attractions of the eastern part of the city.