We had a wonderful stay at Esther's place. The apartment is immaculate clean, very nicely decorated, spacious (specially for European standards), very functional and comfortable. The bed is a double size, good for one person or a couple.
The neighborhood is very nice, there is a grocery in the corner, several cafes and restaurants, and is away from the busy overcrowded tourist area. But still it's a short ride to the museums or to downtown, just take the tram a couple blocks away.
This is a great place for a single person or a couple wanting to explore Amsterdam like a local. Esther left for us some maps, city guide, and useful recommendations.
The only word of caution is that the place is in a third floor and the stairs are quite steep, maybe not for you if you have a bad knee or your luggage is heavy.