Good overall post from Buenos Aires!
I lived there for six months and I truly felt safe. Of course some incidents happened, but I wont blame Argentina for that.
However, I would like to add two things here. Two must-do things while in buenos aires; San Telmo sunday fair/market and La bomba de tiempo, which at least used to be on every Monday.
Argentina should handle its politics better, but what can you do.. With dollars or euros in your pocket, you are well.
And remember to find proper place to dance tango. In general, tango places with big signs are for tourist and are expensive.