I have stayed 4 nights at Marc Aurel, and everything was great.
The hotel is located in a very convenient area, it’s less than 10 mins from the cathedral and basically the city centre, where the shops and restaurants are.
Also, logistically is perfect as is close to the underground, buses, trams and even the catamaran that goes to Bratislava (I recommend that)!
The hotel is small but very clean and the staff is always nice and very helpful.
I had a problem with my room the first night, as it was located on the side of the building close to restaurants and pubs.
It was quite noisy but they have been happy to move me in another room, and had no issues with the street noise anymore.
I totally recommend this hotel, especially to solo travellers!