We loved staying in Maja's place during our end of summer family trip to Copenhagen (kids are 14 and 10).
Maja's apartment is on the top floor of a former army building. It has been beautifully renovated with two double bedrooms (our kids are still okay to share), and a large kitchen and living area. Well equipped, tastefully decorated and with very comfy beds - although after cycling round Copenhagen all day I think we would have fallen asleep on a bed of nails! Maja was there to greet us (she lives on the ground floor). Very welcoming and friendly. The apartment is not far from the little Mermaid and Royal Palace and about 10 minutes walk from Nyhavn. We hired bikes from Copenhagen Bicycles and biked around town, but also got the bus and used the metro a couple of times. There are a couple of local bakeries and supermarkets where we got some basics from. Had an excellent meal at Che Fe which is 5 minutes walk. If you are visiting Copenhagen and want a good, quiet, comfy base then this is a great place.