Safety is a concern - lots of people have warned me about hailing taxis, etc. So any other tips you have would be warmly received...
Well, we stayed very close (across the road basically!) from the Recoletta and we wandered around without any concerns.
During the day - it felt no less safe than Sydney in any major cbd area.
You'll have looked at maps - we walked during the day from hotel in Recoletta, to Florida mall, to waterfront / docks (lots of restaurants) to main plaza and then in evening to 5th avenue and didnt feel concerned at any time. We didnt stray too far at night, but if the hotel you are in is decent, they'll put you in a prober cab (
usually a car like the one i've described @ the airport) and you can make an agreed time for the driver to come and collect you. Basically, we were careful, but did not feel scared at any time (despite being a bit nervous on arrival).
The concierge/driver should also be able to tell you cost (which should be agreed upfront).
If you apply usual travel advice (stay away from demonstrations, dont get falling over drunk, dont buy drugs from random guys in the street - ie. dont be stupid!) you'll be fine!
If you have specific questions re: BA, PM me and I can answer whatever I can.
We stayed at Loi Suites Recoletta - it was fantastic and would stay there again without hesitation.