The included breakfast is not bad. The fact that breakfast is included and that they have a kitchen with which you can make lunch or dinner allows you to save A LOT of money on food, as eating out in Paris is expensive. The staff are very helpful, and we had great times with other hostel tenants in the dining area over dinner. The location is also good as you're right near the sacre coeur basilica as well as three other methro stops, so seeing the sights is easy. Great hostel for the money.
The bar in the hostel is great, they have good Belgian beers for great prices. The kitchen is also well equipped.
Kitchen was great, had fridge to store food as well. Location is awesome, its right next to central station. The staff was very helpful as well. All in all we had a great stay at Ani and Haakien, for the money I think it's the best you can get in Rotterdam downtown area.