I loved my stay at 6400. Friendly staff, fabulous breakfast. I had dinner once and it was an excellent fish buffet.
Like much of southern Denmark, it felt like Covid was in the background,rather than in the foreground. Having said that, precautions were in place.
The room was comfortable and clean, with a nespresso machine and Netflix on the TV, but the bathroom was a little out dated.
The building design I found very pleasing, but it’d look much more fitting to be on the shoreline of the Flensburg Fjord than its actual location.
The location is out of the town, in a residential area so it meant you must drive to Sonderborg, but the room rates reflect that as it’s much cheaper than the city centre/beach hotels and has lots of free parking.
Nevertheless I felt very comfortable there and I’d definitely go again.