I lived on the 5th floor of Spring block for four years during the early '80s. I can recall there was a limited colour scheme with some of the panels in my block being red.
I enjoyed my time there, felt very safe (despite claims of violence being on every street corner) and only suffered one bad incident when a mattress was set alight in the basement. The fire itself wasn't much of a threat but the fumes from other items which caught fire were putrid.
One incident which reinforces the safety of the flats was that I was working in London during the week, and only returning to Sheffield on Friday nights. One week I forgot to lock my flat door, yet everything was intact when I returned on the Friday night.
Not everything about those flats were good however. The heating was underfloor electric (expensive and useless) and a 3 bar electric fire. Consequently not only was the flat cold in the winter but it suffered badly with condensation and consequently mildew on the walls. The damp atmosphere also encouraged silverfish and I was constantly at war with them.
The good thing however was that my flat overlooked Sheffield so getting home on a Friday night and sitting on the balcony with a glass of beer (or 3) was good for the soul.