Marlous and Michiel's house was the perfect place for us to stay in Amsterdam.
The house is huge and well laid out and I've never seen such a comprehensive guide to Amsterdam by way of a giant binder in any rental before.- restaurants, sightseeing, museums etc. The space is super clean and my kids enjoyed hours of play with the fabulous toys in the house.
The house is on a very quiet street but yet only two blocks (4 minute walk) to the Museumplein. Also the connections by public transport to the old town, central station and the airport are right there.
The steep stair case was a minor irritation to my old dad but he managed. I would imagine that anyone much older would have some issues. But for the kids- my two very young kids had no issues with the stairs at all. There are optional baby gates everywhere though so it's not a safety issue.
We will definitely try and stay here again next time we are in Amsterdam!