We stayed with Marta for 5 days. This was our first time in Amsterdam. Marta is incredibly helpful and can't do enough for you. It was like having your own personal tourist guide ! She went out of her way to make us feel very much at home and welcome. She helped us book tickets on line for various activities and took us step by step through the best way to spend our time there. Our experience was that the Amsterdam tourist office is not particularly useful, so without Marta our holiday would have been a very different experience.