This hotel consists of two buildings on opposite sides of a busy street.
One building is rated 4 stars, it has the reception desk, the local information, the waiting area with comfortable seating, the breakfast room, the bar, the patio, the staff. I have not seen the rooms, only one person from our group was there, she had a single that was small and unpleasant, she said. But that building has recently been renovated so the larger rooms might be fine.
The other building has none of those amenities and is rated 3 stars, though many of the rooms don’t merit one. Look up Hotel Ratings on Wikipedia and scroll down to European Hotelstars Union, which rates hotels in Austria and other countries. I think they either have not inspected the Neutor or they were shown selected rooms. The article describes the difference between,for example, 2 and 3 stars, which doesn’t speak to the size of the rooms, the quality of the furnishings, the convenience or modernity of the bathrooms, or other issues which affect one’s satisfaction.
I had a single room in the 3 star building which was like an old dorm room. It was quite hot in late May, there was no a/c in any of the rooms, and though I asked for a fan on night one, it arrived only on day 3 after I asked again. The street noise was loud so I / we had to choose between traffic noise with the window open, and a hot stuffy room with it closed.
There were a few in my building who were happy with their rooms, notably a pair of women who shared a room on the top floor, with the terrace. We were part of a choir group on tour and many complained to the tour company about the low quality of this hotel. A few unfortunates had major construction right outside their window that started before 7am each day.
The location was great, WiFi was decent, the breakfast was good, and the desk people were efficient. But I hated my room and having to cross the street for even a coffee (no in-room kettle or minibar) in the morning, and it was so small and spare it was hard to feel relaxed.