In general, the flat was ok. The host was punctual, helpful and responsive. However, the condition of the flat was not very pleasant if you care about details (like me).
Firstly, it was not that clean. Sofa, chairs, and beddings had some obvious dirt. Secondly, the hot water was limited. As the hot water in the boiler was only enough for 1.5 showers. It took about 30mins to top up enough hot water for the second person's shower. (You may want to consider it if you are a large group) Also, the flat looks like converted, which means that most part of wall are not solid. So the soundproof was not good. You can hear your neighbours quite clear.