My fiancé and I stayed at Sebastian and Stephanie's wonderful apartment during our visit to Amsterdam and what a delight it was! They were such gracious and welcoming hosts, with Sebastian providing us with a thorough orientation of the city, along with some local tips to help us experience Amsterdam beyond the tourist attractions. They were completely responsive and made themselves available should we have needed any assistance or extra information. (Getting there was easy as they provided us with a very exact set of directions very much in advance of our arrival.)
The apartment itself was delightful, cozy, and located in an idyllic part of town. It was an easy twenty minutes tram ride (the stop is unbelievably convenient to the apt's location) from almost all the major sites, with a beautiful park, food plaza, and the Space Center station to the airport all only 2-7 minutes walk away!
Overall, Sebastian and Stephanie's place was exactly what we needed and it even exceeded our expectations. Beautiful, safe, and convenient. We wouldn't hesitate to stay with them again should we find ourselves back in Amsterdam.