I bike in BA quite a bit and have biked in New York, Rio and Seattle. BA is now instituting a program to expand its ciclovias. There are some new ones appearing in odd places, but that may be more because I lack any sense of direction than the locations are themselves odd.
It is crucial to exercise extreme caution on streets shared with vehicular traffic. I can't decide who is more inconsiderate: bus drivers, taxis, or motorcyclists. For the first time I will soon attach a rear view mirror to my helmet. When you are travelling in a relatively straight line drivers will pass leaving extraordinarily little space between you and them - should you come upon a hole in the road or some other obstacle requiring you to veer out of your line, you run a serious risk of veering into the path of an overtaking car or bus.
Don't even think about going the wrong way on a one way street. Oncoming drivers take that as a personal insult and will seek to punish you by driving directing at you and leaving as little room as possible ...even if there is no need to.
It is generally wiser to ride on the left hand side of the street to avoid buses and slow moving taxis that merge toward the righthand side of the curb. They will ignor their turn indicator and you both.
Have fun.