Harry and Carolla are great, thoughtful and warm-hearted hosts. The room that they provided was larger, cleaner and more lovely than I thought. They provided almost everything, a big bed, a large sofa, even an ottoman and a closet, different brands of wash supplies. Whats more, he also prepared us with free bread, snacks , yoghourt, cereal and juice, which really saved us when we couldnt find a resteraunt nearby at midnight. BY THE WAY, they also have a lovely backyard for you. If you go to Holland during cold days, they can also have radient floor heating! It is really warm inside the house.
You can take No.14 bus from Amsterdam Central and get off at Alexandraplein(not sure about the spelling). Its about 15 mins. You can also take a straight bus to museum square.
At last, I will write some comments for Chinese travellers to save you some time to read my English version. 房东人很好的，屋子很宽敞，我算了算大概60平米大开间，有厨房，大床大沙发，脚凳，还有个衣帽间。洗漱用品全都有，洗发水沐浴露还有七八种牌子，不过没找到拖鞋。他还准备了面包零食麦片酸奶饮料等。房间外还有个独享的后花园，屋内有地暖，开了地暖很暖和。
房子离中央火车站15分钟公交，出站后坐14路直达，在Alexanderplein下车（不确定拼写），也就是Artis 动物园的下一站。去博物馆广场的话也是公交车直达，忘了车号了，就是出门过桥在街角处东边坐车。基本就是这样了，good luck!
Strongly recommanded. 特别推荐。