This is a nice large and comfortable apartment. It's quirky and interesting and is well maintained. The hosts are helpful and give nice clear instructions on how to access the apartment, etc.
Because it's below ground, there's very little natural light - we were out all day and only there in the evenings, so it didn't matter at all, but if you're there in the day then it's hard to know what the weather is like outside!
Only other comment is that the towels provided are very small - so bring your own large one if that's what you like to use after a shower!