5 aircraft and 6 cabin layouts, from the DHC Dash 8-400 to the A330-300. Pick one for its seat map, the best seats and the seats to avoid.
There are seat maps for 5 RwandAir aircraft here: the Airbus A330-200, the Airbus A330-300, the Boeing 737-800, the CRJ-900 and the DHC Dash 8-400.
The Airbus A330-300, with 274 seats: 30 Business, 21 Premium Economy and 223 Economy in its main layout.
The Airbus A330-200 and the Airbus A330-300 have Premium Economy in at least one layout.
The Airbus A330-200, with 32" of seat pitch in Economy and seats 18" wide.