Niels' flat is really amazing, big and cozy. It is fully equipped and really well decorated. In addition to the big flat, there are two terraces which are really pleasent. We found there everything we needed and this made us feel at home from the first minute we entered in the house. We slept there in 5 people for 3 nights and we really enjoyed our staying in Copenaghen. One of us had to sleep on an air matress but we already knew that and so also this was ok. There is a bike sharing station just under his house (which I would recomend) and also the train station is quite close, less than 10 minutes by walking. The district is full of all the necessary utilities, beautiful and silent. We didn't meet personally Niels but we had a good communication and we didn't need to ask him anything during our staying.
Finally, I would higly recommend to stay in Niels' house, mostly if you are a family with children or a group of people of 4/5 people.