I booked with Ralf for my parents who came to visit from Sweden. They were very happy with both the appartment and with the friendliness and help from Ralf and his team. Although they were at times communicating with all the three of us, they were very patient, correct and orderly, and the pickup at the airport was there when my parents arrived in spite of a 10 hour delay.
Personally, I think the location, the view and the facilities of the appartment are very optimal for a reasonable price.