HI
The weather in december is at the beginning of rainy season, so it is hot and humid although it is still confortable in the center (Tana region) when you get out of the capital.
I know a good driver. His name is Liva. He knows the country very well and he is reliable. But he speak french. You can reach for him at this email:
rgn@mel.wanadoo.mg
I have done my Ilakaka (saphirre town) reportage with him.
As for Hotel in Tana, what is your budget?
Low budget (15 Euro) : Tana Jacaranda, a hosting house confortable, clean and reliable with wi-fi and shower and WC on the floor.
http://www.tana-jacaranda.com
tana-jacaranda@tana-jacaranda.com
Mid budget (75 Euro) : Tana Plaza on the Indendance blv, right beside the old train station. Excellent service, extra clean, confortable. WC and shower in room.
High budget (~ 100 Euro) : Royal Palissandre wich have the best vue over the city, and “Hotel Colbert” in the “Haute-Ville” beside Presidential Office. This last one is THE Hotel of choice for business and confort.
Of course there is the Hilton but I don’t really like it since it is big, impersonnal and too expensive.
In Ambatolompy you can stay at the “Manja Ranch”.
YOu can PM me for more info since I been there 7 times for many months at a time.
Best