Ned's place is IDEAL for people participating at conferences at OKURA hotel (or RAI as far as I understand). The space is clean, fresh, everything you basically need (towels, fresh linens, fridge, coffe maker - note there is not a separate kitchen - everything is on the stairs hallway, the room being separate with own bathroom).
Heating is another big PLUS, it works instantly after you set it, and keeps the temperature constant.
Keep in mind that the Amsterdam famous stairs are very steep and narrow and you have to climb basically 4 floors - that is really really not easy after a night out especially.
Ned was a great host, helped me with the luggage checking in, he tried to be communicative with regarding sightseeing etc, but since I had a full day everyday at the conference - coming home at 1-2 in the morning, I didn't really have the time to do anything he suggested.
Oh - and DON'T listed to google maps if you come by tram, get off at maastraat station, it's very close. google maps had me get off 2 stops before ...