I'll add what little I can. I have never been to Madagascar but I used to have a friend who went there for I think 6 months or something to stidy lemurs or something? He seemed to like it a lot, although he was mostly in the jungle with researchers I think. I remember him saying it was extremely dark at night there! He seemed to like the town too and played me a tape once of some Madagascan music which was quite cool. it was maybe 8 years or more ago though sorry,
Hope it might help and have anice trip if you go!