Shared Leon's apartment with three friends for a week in Amsterdam. A total of 4 middle aged guys were very comfortable. We used the extra room on the 4th floor, which has its own bathroom. The apartment is well appointed but has a small kitchen. That wasn't an issue for us as we ate most meals out. There is a large and comfortable living space where we gathered to talk and have drinks.
The location is very convenient for walking to the Jordaan and Central, and is about a 30 minute walk from the train station. Lots of great restaurants and bars within 5 mins or less of the apartment. The view of the traffic circle at Hugo was mesmerizing---so fun to watch the world go by from the apartment windows.
Leon was an incredibly good communicator---he answered all questions very promptly and was very kind in meeting me first thing in the morning after I arrived from my flight and train into the city. He will even pick you up from the airport for 50E if you want. Highly recommended!