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Watch out, there are spooks about!
Sorry Nick, no idea on rates, long-term or otherwise. Is it for you or your son? How old is your son? When is he going to start?
The popular way around here is for the school kids to rent a house for about 3,000 ฿/month. Depending on how many are sharing would determine the cost per individual. Long-term rents for a one-room apartment are shown on Karakara's website (
http://www.surin.thaiapartments.net/index.php?os=2&favorite=8&lan=en). Typically these rents are from 2,500 to 7,000 ฿/month although, as with the house, transport is probably required to get to and from school. Surin Mansion Apartments (400 ฿/day - 4,000 ฿/month), just across the road from Corner Cafe, is just a short walk from the school, probably less than a kilometer. These are new apartments and look good value.
Hope this helps. If you need a guided tour around Surin please let me know. I can show you some of the more popular residential areas.