The way to the cottage is very tricky to find. So a Czech friend advised us to give up going by public transportation but go by taxi, and even the taxi driver dropped us at a wrong place with the correct address. We had told the host we would arrive between 15 to 16:00. But until after 18:30 we received no answer at all from them.
Later the host said to me, "When we were away, why did we need to answer? We are not a hotel." This explains everything.
Due to the sudden absence of the host, washing machine, garden, swimming pool were all not accessible for us, but no discount nor apology. Moreover we've got many insect bites. I would not recommend this place to anyone.