We stayed in the flat for a week with our little daughter (18 months). Mirja was so kind and got us a high chair. We cooked a lot in the flat and found the kitchen very well equipped. We especially liked that there were Tupperware boxes where we could pack snacks for the day.
For sleeping arrangements, we made a "family bed" out of the folding sofa and the folding bed, which worked well. As other reviews have noted, the sofa is quite hard without the mattresses from the folding bed, but acceptable to us as we knew what we were getting into.
The bathroom was really small, corpulent people will bump into every corner and edge. For a short stay, however, this is also acceptable.
We liked the location: We had enough supermarkets around us and we could quickly get to the ferry pier and the metro. Alternatively, you can walk from the flat through beautiful streets and parks to the centre.
Insider tip: Juno the bakery. Quite an expensive bakery, but the pastries taste excellent!