The Simon Communities has raised concern about a dramatic drop in the number of properties available for rent.
According to the charity, there has been a fall of 55% in the figure across 11 towns and cities since May.
Some 80% of places were beyond the reach of those on rental assistance payments, it said.
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Gardaí are seeking a man seen leaving a house in Dublin 8 where the body of a man was found yesterday.
The man, thought to be in his 20s, was seen exiting the property on the South Circular Road at about 3.20pm.
A third man was discovered injured on the road close to the scene.
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Hillary Clinton and Donald Trump's vice-presidential nominees have squared off in an insult-laden TV debate.
From the very start of the 90-minute clash, Democrat Tim Kaine was on the attack - aggressively challenging Trump's qualifications to be president and criticising the billionaire's tax affairs.
Republican Mike Pence shot back by laying into Mrs Clinton's record in office, accusing her of bungling foreign policy.
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A million people on the South Carolina coast are set to be evacuated as Hurricane Matthew heads towards the United States.
The powerful Category 4 storm has already left a trail of destruction across the Caribbean, killing at least 11 people - and slammed into Haiti with howling 145mph winds.
The most battered peninsula has been cut off from the rest of the country, with floodwater running at shoulder height in some places, and reserves of drinking water running low.
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Nurses at the oncology and radiotherapy ward at Cork University Hospital will begin a work-to-rule this morning.
Patients have been assured that direct care will not be impacted by the protest over staffing levels.
The hospital has described the industrial action as "entirely disproportionate" and "unwarranted".
