My stay at Michał's place was very very nice. The location is just outside of the main HB station area but is connected well by the 2/3 lines just a few minutes walk away. The room is small but tidy, and the apartment is clean and safe. Michał is extremely responsive and is willing to give suggestions and make sure you have what you need. The pocketwifi made a huge difference for me, otherwise I would've been stuck ducking into cafes all the time just so I could snag some internet for directions.