Had a great stay at this apartment with our 3 & 6 year olds. The location is fantastic - right in the heart of Copenhagen. We walked everywhere we needed & enjoyed all the city has to offer. Just around the corner is 'The King's Garden' (Kongens Have) park which the kids loved along with the old harbour (great for canal boat tours).
The apartment is very clean & on the 2nd/3rd floors accessed by a gate from the street then up a spiral staircase (easy walk up). There are 2 large bedrooms on the lower floor with a wet room bathroom (shower only) & one smaller double on the upper floor along with a fully fitted kitchen & lounge area (smart TV included).
The only thing to note is that this is 1) an old building - so noise does transmit from floor to floor (ie. you can hear people walking on floor above) 2) it's a central location - so noise from revellers on the street can be heard as well as bin trucks etc.. Neither bothered us too much, but be aware if you're looking for peace! We'd love to return to CPH.