Good that you booked this hotel, I'd do likewise since I am familiar with this hotel, it's right by the train station, Krakow Glowny, a few minutes walk. The Mrs and I stayed there twenty years ago, it was fine then.
In 2017 she stayed there again on a solo trip to Poland as I had already come back from my Europe trip. She liked the hotel even more so. In 2017 the hotel had already been refurbished, the immediate area built up, (galleria) , etc. even better than what we found it in 2001. Next trip to Krakow staying at Europejski is well worth it.
Going to the Rynek, the large main square, is ca 4-5 walk...nice all around.
I don't base my choice of hotels or Pensionen on reviews. That is for sure not determining factor in Poland, and above all, in Germany.