In reply to andy healey: Grenoble is a superb city for Winter activities, ice-climbing, ski-rando, racketting (snowshoeing), Winter Alpinism, in the Ecrins and the Chartreuse. The vision of the snow-clad Belledonne mountains shimering in Winter sunshine as you drive along mundane urban streets is stunning. Alpine climing is very accessible in the Spring and Summer, La Grave is only 1.5 hours drive away.
Things like cycling and walking in the mountains are excellent, at most times of year.
Not so keen on the rock-climbing personally. There is lots of it, but it is entirely bolt-clipping, though some of it in exciting situations like the sheer face of the Dent du Crolle. My friend who lives there still misses British sea-cliff climbing and mountain areas like the Lakes and Wales.
The town, with the exception of the quite small old town that someone-else mentioned, is not very attractive at all - much 5-6 storey garish or drab concrete blocks, though the houses in the surrounding "suburbs" like the Chartreuse, the Vercors and the Balcon de Belledonne can be lovely. Never been aware of the gangsters though, nor does it feel threatening.
How confident are you that you can get a job there though? There is a great deal of competition for IT work and a lot of unemployment, which can only increase.