Really good experience, Derrick met us in person for checking in (even though our arrival was later than expected, he waited patiently) and explained thoroughly every possible thing about the flat and the building. He provided the biggest list of local things to do and provided good practical tips. There's also info on arranged day trips if you fancy going on one of those.
The flat is very centrally located on a busy street, but is still absolutely quiet as it is on the upper floors, so the street noises won't come in at all. It is keyless system, and you can even set your own PIN code, so it's easy to remember. You will only need to carry a little tag that opens the building door and unlocks the elevator.
The flat is exactly as pictured, and with the washing machine on the balcony you can even do your laundry without leaving the flat. Only possible downside for some might be the lack of cooking opportunities, as you can only boil water, but there's so many places to eat within a stones throw that it didn't bother us at all during our 13 night stay.