On our first night in Montreal we walked over to Rue Saint-Paul and over to Stash. The restaurant was chosen from the Yelp reviews and it was pretty close to our hotel. Rue St-Paul is an awesome little street with numerous restaurants and shops.
I have had Polish food in Philadelphia but Stash is different. The Polish places I have I been to before were mostly in bars or semi cafeteria style but Stash is a really, really nice place. The space is very old world inside and warm with a wood and stone interior. We were there in June and the windows were open. They had a live piano player that only added to Stash's charm.
Everything we had we really great, including the Pierogis. I had the Polish Stroganoff and that was pretty darn incredible. The potato pancakes were the best I have ever tasted. The dessert was also excellent. Our server was great and helped us with our choices. The prices were reasonable.
Stash is a great restaurant to try in Old Montreal. It won't disappoint.