I really love Heaven restaurant. Situated on a quiet, pretty street in Kiyovu with completely outdoor seating set up in a very pleasing way.
The last few times I've been I always ordered the curried fish as it was so delicious and I've never been disappointed. They also have creative offerings including hor d'ouvres and the mixed drinks are lovely! One of the most unique menus in Kigali and really something out of the ordinary. They also try to support local producers (farmers, cheese makers, etc) which I just love about them. They even sell jewelry made by some of the marginalized members of Rwanda society (Congolese refugees living in camps located in the countryside, etc). A big thumbs up!