Our host wasn't here when we arrived (but it's normal it was the afternoon). He gave us a lot of indications to access to the flat where we could have taken a cup of tea in their cute garden before to go to visit Amsterdam.
Moreover, Yahav gave us two bikes to discover the city, it was a very good idea (and economic !). He gave us also a pretty cool map and his own personnal english guide with his recommendations about bar, restaurant, coffee, etc..
We met them just few minutes and we are sad because we didn't had a chance to talk more with our host, but we were really tired due to an intensive and shortly trip.