I think it could be this one which is another of my favourite bars/restaurants
https://www.tripadvisor.co.uk/Restaurant_Review-g188590-d919026-Reviews-Restaurant_Cafe_Van_Puffelen-Amsterdam_North_Holland_Province.html
About 10 minute walk from Cafe du Prins as you head down the Prinsengracht Canal
Brilliant bar and only about 10 minutes walk from the Prins
Amazing beers on offer and the jenever gins they have especially the Corenwijn's are something to enjoy.
It might be one of these brown bars
https://www.tripadvisor.co.uk/Restaurant_Review-g188590-d2659631-Reviews-Cafe_Smalle-Amsterdam_North_Holland_Province.html
Great little bar and nice snacks...