Don't let the plain looking store fool you: They have amazing pastries!
I recently purchased a birthday cake at Dufflet and was truly impressed. The prices are very reasonable and they offer a huge selection of delicious cakes! They also sell Cakelets, which are much smaller than the regular cake and could be a great option for smaller gatherings.
I had the hazelnut cake and it tastes just like you would expect: Amazing. Imagine a mix of Nutella goodness, hazelnuts, chocolate, white chocolate in pure sugar heaven.