Elmar's apartment is awesome, spacious and very comfortable. We felt at home and liked everything, the decor, the comfortable beds and living room area, the collection of traveling books.
Elmar himself is a great guy: he was hospitable, gave us some good tips on what to visit and generally made our stay very pleasant.
The experience was so good, that if I ever visit Amsterdam again, I would definitely check to see if Elmar's place is available.