the-witcher-3
I was already there once during the main quest, but I can't find the place again. I read later that there is a merchant there selling really good saddlebags, and I'd like to visit that merchant. But Novigrad is just so big, and I didn't memorize the location of Putrid Grove.
Where exactly in Novigrad is it?
According to this article.
Vivaldi Bank isn’t marked on the map. You’ll find the bank on the main square with the market. It’s the building with the large coin hanging above the door. It’s behind the bonfire were they burned witches once you arrived in Novigrad.
This article has a picture of where the bank is located:
Complete the quest: "Ladies of the Wood".
I finally found the Baron's wife, it turns out the part about investigating all remaining leads refers to the leads about Ciri. There are two quest series about Ciri in Velen, and at this point you have to follow the other quest series to complete the "Family Matters" quest, and "Ladies of the Wood".
Best Answer
Enter the city from glory gate take the left on the main road and circle around the "block". Before the intersection you should see a door (as in the picture) on the right, knock and you're in "putrid grove"!
Below image of the Door, and an image of the map facing the door.