We stayed here (2 couples) for 2 nights in July. The apartment is very spacious and is located in a lovely quiet neighbourhood, close to the Vondelpark and Overtoom, which has excellent transport links to the city centre and airport.
The weather was really warm during our stay so we took advantage of the large roof terrace.
You can walk to the likes of the Leidseplein and Museumplein in about 20 minutes, but I'd recommend hiring bikes for a more authentic and efficient way of getting around this amazing city.
Jacqueline was away when we stayed but her correspondence and information prior to our trip was excellent. I'd recommend staying here if you want to experience a traditional Amsterdam property away from the noise of the city centre.
One thing to be wary of, access to the apartment is up some very narrow steep staircases and there is no lift - so it may not be suitable for everyone, particularly with luggage.