The apartment is well located, and as previously written about a 15 minute walk to the Central station and 30 minutes to Nyhavn. We were 6 in total (2 adults, 3 teenagers and a 2 year old) and the place was perfect for us as there are a lot of toys, a swing and 2 bathrooms. Also there is an excellent playground a one minute walk from the apartment, a trampoline and rabbits in the back garden (where were able to keep our stroller as well) Lars also was kind enough to buy a travel bed for our daughter.
Communication and everything around this went super smooth. Lars was there to meet us. He gave us a tour of the place, chatted for a bit and he was on his, letting us know he was staying close by and to just call if we needed anything.
There are easy bus connections right on the street. We took the #14 to the "Harbor Bus" (public Ferry), which was excellent and inexpensive way to see the city from the water. http://www.visitcopenhagen.com/copenhagen/harbour-bus-gdk447302
If there is one downside it would be the apartment gets a little warm if you don't keep the windows open at night. There was some street noise very early in the morning (in the bedrooms) so you have to choose your poison here. I am a light sleeper, so take this piece of information as is.
Otherwise, I fully recommend this apartment.