Sunnyside, San Francisco is relatively safe compared to its neighbors to the south and east. There have only been about a dozen assaults in the last 6 months (as opposed to close to a hundred in Mission Terrace just to the east). There have been no murders (2 in Ingleside just to the south).
It is not really a place people go to have fun. It's proximity to the Glenview BART and the City College is its big selling point. It is also the perfect midpoint for couples who may work in the city and go to SF State. It's also relatively affordable.