We were in an MC Suite on Deck 6 for the October 30th crossing and the smell of sewage (not mold) was suffocating. The entire Deck 6 (midship) smelled absolutely rank. The "Retreat Team" was made aware, and maintenance was called. We spotted the maintenance team several times working in our hall but no improvement was made... The cabin itself was fine but deck 6 midship/starboard was a mess.