Haven't been to Antananarivo for over thirty years when British Aerospace sent me to flog them a 125 so my info is out-of-date but my recollection is that very little English is spoken there so brush up your French. I concluded my business there fairly quickly but had to wait a good few days for a flight out (back to NBO IIRC) and so ran out of reading material. The only English language book I could find in the whole of Tan was a s/h copy of the (auto) biography of the founder of IBM, Thomas J Watson. Again IIRC, not very interesting (to me at least) but the memory of it has stayed with me!
Another faint recollection is that I had to spend a few days in Paris (it was tough working for BAe in those days) waiting for the Malgache embassy to issue me with a visa although that requirement has probably changed.