Thieves are walking freely into residences in Cathays as students are continuing to leave their houses unsecured.
Police are urging students to lock their windows and doors after seven burglaries took place on streets including Harriet Street and Ninian Road last bank holiday weekend.
Roath has also been a target for crime in recent weeks.
Two robberies have taken place, one at knifepoint, and police are appealing for witnesses.
The crimes are the latest in a string of incidents to have taken place in the heavily populated student areas over the last year.
In October 2007, gair rhydd reported that police officers had found 13 houses unlocked in Cathays in just 30 minutes.
Students were leaving their valuables in plain sight of thieves, who were reportedly exchanging stolen laptops for heroine.
Head of Roath and Cathays CID Detective Inspector Keith Joshua urged students to take measures against “opportunist thefts”.
But this most recent crime spate has caused police officers to reissue their plea.
Sergeant James O’Donnell, from South Wales Police Community Safety, said: “Thieves are walking the streets, simply trying the handles of doors and windows. It is their lucky day if it is left insecure and they can get easy access to the premises.
“Our advice is to always lock doors and windows, even during warmer weather.”
Despite continued advice from police, however, negligence is an ongoing problem in Cardiff’s student areas.
The South Wales Police Student Initiative, which is soon to celebrate its first anniversary, sees students patrolling the streets in an effort to combat student-targeted crime.
Special Police Constable Sam Tappenden, who helped to establish the Initiative, said overall crime against students in the city is down by 25%.
He said: “There’s nothing new to say prevention-wise. Students need to be individually responsible and take simple measures like leaving a light or a radio on when they go out and not leaving boxes for new TVs or computers out in the street.
“It’s common sense”, he added.
Meanwhile South Wales Police issued an appeal for information about the Roath robberies.
Two masked men broke into the Halifax bank on Albany Road at around 11.30pm on May 27.
Security guards were filling the cash machine when the incident occurred, but the men were not armed and no injuries were sustained.
The robbers exited the scene in a dark coloured VW Golf, making off with what police have said was “a substantial sum of money” towards Diana Street.
A 38-year-old pizza deliveryman also became the victim of a knife-point robbery in Castleford Place at around 11.30pm on Saturday May 24.
An 18/19-year-old white male, who was wearing a blue FCUK hoodie and was missing a front tooth, is the target of a police search, along with a 17/18-year-old white male wearing a black baseball cap.
A third male is also suspected to have been involved in the crime.
The news comes after gair rhydd revealed last April that five street robberies had taken place within the space of 24 hours in Cathays and Roath.
But Tappenden was quick to reassure students that, in Cardiff, robberies involving students have seen a 33% drop.
He described violent crime in the Cathays area as “rare”.
Anyone with information about the burglaries or robberies should contact Crimestoppers on 0800555111.
