Overall, it is a great place to stay when visiting Copenhagen! We are two families with one kid each (6 and 3 years old).
I will start with (the very few) things that we didn't like or expect (but this is really individual). This is a house where Marie and Tor and their kids live and it felt a bit awkward to stay in this house with all their belongings. But on the other hand, it gave the place its charm and warmth. And after all, this is what AirBNB means (you don't stay at a hotel but at someone's place). Another thing that some of us didn't like were the steep stairs. I think this is typical for Scandinavia or even for the Netherlands, but if you have difficulty with climbing stairs, you should have in mind that there are stairs from the ground floor to the first floor and from the first floor to the second floor. Finally, there is only one bathroom in the house, which is not always convenient. The bathroom is right next to one of the bedrooms (with the kingsize bed) with a door from the bedroom into the bathroom. The smaller kid had to go to sleep earlier in that bedroom and it was not easy for the other people to keep quiet when going to the bathroom. Also, there is no bathroom on the second floor. But I guess this would not be a problem for other visitors.
Other than that, we think everything was great. The house is in a really nice neighborhood - quiet, clean, green, close to the Zoo, a big park and with very convenient transport connections (the metro is 10-12min. away and buses are even closer - 3-5 min.) There are superstores working late.
The house is big enough and we had no problem sleeping there. There is one big bedroom and three smaller bedrooms on the second floor. There is a very nice living room and dining room (basically, one open space on the first floor) with a very nice terrace (which we could not use much due to the cold weather and rains). The bathroom is also nice and clean with towels, shampoo and shower gel. There is (obviously) a fully equipped kitchen, if you want to prepare something.
There is a very nice small yard with green grass and chairs (if you are lucky to have good weather).
So this really is a great place, very cosy, at an excellent location and with everything you may need.