We had a great stay. The location was fantastic - just a short walk from the tube to get into London very easily. The area was safe with lots of shops and restaurants nearby.
The flat itself was very spacious with everything we needed to make ourselves at home for the weekend.
We didn't have any issues we needed to speak to Krzysztof about but messages we sent to him prior to the trip and during (to let him know we had arrived) were responded to promptly