Lars' apartment is very central, we walked everywhere, even with our big bags to and from the central station and to Tivoli- which took at the most 10 minutes. There are also several grocery-stores closeby. The room is very spacious, but we found the table we had to eat on in the room a bit small if you're planning on cooking a bigger meal.
Lars is a nice person and easy to talk to.
Overall it is a great place to stay in a few nights in Copenhagen and we would definitely recommend it.