I first stayed here with my boyfriend in December (we booked/reviewed through Airbnb) and I loved it so much that I came back with my best friend.
Sem & Pieter are amazing hosts. They are so thoughtful and always respond to emails. Every recommendation was fantastic! The area around CityHub is great; there are tons of shops and restaurants nearby and you don't feel so touristy. It's only a few blocks away from the Van Gogh Museum and Vogelpark, and within walking distance from most of the main museums in the city.
The hub itself is unbelievably comfortable. The pictures make it look smaller than it is. Both times I've stayed in the bottom hubs, so I can only speak for those. There's enough space for two people to get ready, spread out, etc. without being crowded. And THE BED. I've dreamt about that bed every night since I left its comfort a few weeks ago. It's the most comfortable bed I've ever slept in. The only complaint about the hub itself is that you don't know what time it is and you might end up sleeping in!
The shower/toilets are shared, but everything is very clean and you're only sharing with a max of seven other people. It's the price of a hostel, but the service/cleanliness of a hotel. I would and will stay here every time I return to Amsterdam.