I would suggest the south side of the island, I stayed at Riambel for about 3 months, beautifull nature! More then once I got up early to walk 5km before asking a ride to work from some of the very friendly people who live there!
As for accommodation, you should contact the following person:
Nolan De Chalain
Cell: +230 258-1361
If you do, give him the best regards from Ken (from Belgium). Ask him for the studio's he has at his place.
EDIT: woops, I just had a look at the dates, looks I'm a bit late. Well, hope you're having/had a nice time ;)