Don und Inge are really welcoming hosts.
They had everything prepared and left us with no open questions. Also they were always very fast to respond!
The apartment is very bright and has a really high ceiling and and very nice old style.
The biggest pro were the bikes. After having a little problem with the lock (they called us for it within minutes on Saturday night!!).
My advise: don't buy a metro ticket for the weekend. Just explore the city by bike!