What more can I say - perfect location and perfect host! Maciej was a great and timely correspondent answering my various queries before I arrived. As other guests have already noted, the location is very central and in a very attractive area with lots of wonderful small parks and eating places close-by (within 5 mins walk). It is extremely easy to get to if you are using public transport.
The apartment itself is roomy with a high stud and very nicely furnished. The bedroom for the guest is plenty roomy and the bed very comfortable. As it faces a busy street outside, it does tend to get traffic noise so you may want to use earplugs. I did and the traffic noise wasn't a problem.
Marciej is a very considerate host and I was lucky enough to be able to spend time with him having some very stimulating conversations. This was my first airbnb experience and I can't imagine doing better!