I stayed at Kith & Kin for a month on arrival in Amsterdam while looking for permanent housing. Really lovely and responsive host. The apartment has great design and is impeccably clean. The beds are also incredibly comfortable which is a huge plus when you are staying in an Airbnb for a whole month.
There was a lot of very loud construction upstairs and the host kindly moved me to another unit that was quieter.
Only con I would give for long term stays is that the kitchen is small (no oven and only electric plates) so it’s a bit limiting. It would be no issue for a shorter stay and when the city is not in lockdown :)
Overall, highly recommended.