We thoroughly enjoyed our stay at Aperon. The location was so strategic and was close to (within walking distance of) many places of interest in Copenhagen. The Aperon Team was terrific! So responsive. I must have messaged them many times before our trip to Copenhagen to ask various questions--about the unit in particular (is there a wine bottle opener, is there a code or a fee for the washing machine and dryer, etc.), and about Copenhagen in general (how to get from the airport to the apartment, etc.). One of the Aperon staff responded in a matter of minutes each time. They were very courteous, and they even booked a taxi on our behalf for after our checkout, to get to the airport (we had an early morning flight to catch).
The only tip I would give to future guests is that there is no elevator, so if you happen to get a unit on one of the upper floors (we were on the second, which was the equivalent of the third floor in the US), be prepared to haul your luggage up a few flights of stairs--if you are not traveling light. Also, if you live in the US or an Asian country and are used to the convenience of microwaves ovens, be aware that the units don't have microwaves, although there is a stove and an oven. Other than that, this is a really wonderful place to stay in, if you're visiting Copenhagen.