Our stay at Kim and Daniels was great. The location was perfect for us. It is close to restaurants, however less busy than Amsterdam central and other places. Still, it is just short walk and ferry ride away from all the sights of Amsterdam. Also the north itself has interesting things to offer.
The studio was also a great place to stay. You have everything you need, including a big balcony where you can sit and relax. The bed was comfy, too. Would definitely come back.