Olari is a nice suburban crag with a couple of nice sectors. Lasagne and Absolution are the two stand out options, but the other two offer enjoyable climbing as well. Access is easy and the sectors are all right next to roads or paths. All sectors except Kobrakallio have decent shade. Rock type is mostly the basic Finnish red granite and is mostly alright for the skin. You can climb most routes with 1-2 pads, but the landing of Lasagne and the landings for some routes at Absolution is filled with smaller rocks which you probably want to cover up with extra pads. Also, having a lot of pads is always nice for the taller routes at Kobrakallio.
Some standout routes:
Absolution, 7C: The hardest at the crag, a high quality roadside testpiece.
Lits-Läts, 7B: A spectacular overhanging route with intricate beta options.
Super-Lasagne, 7A+: A technical testpiece requiring good friction and hooking skills.
Freedom Fighters, 6C+: A powerful short overhanging boulder requiring commitment.
Lasagne, 6B+: A hard top out sequence considering how little climbing there is.
Sadekatto, 6A: A nice warm up with surprisingly technical positions and good holds.
Olarin Kameli, 5: An easier route for the beginners.