A319
Flight Crew Total 2047; Flight Crew Type 1208
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Landing Without Clearance
General Flight Cancelled / Delayed
Aircraft
Aircraft had an Aft Lav inop due to a waste can flapper valve and the APU bleed inop. At the time I contacted maintenance control and was told the Aircraft would be full on [both legs]. I was to keep the Aircraft; all the way; and was concerned about the reduction in lavs. Maintenance said they were unable to repair; so I refused the aircraft for safety related issues of people gathering in both lavs to utilize the reduced facilities.
A319 Captain refused the assigned aircraft due to inoperative lav.