Most of your requirements would be met in Cambodia where more and more tourists are coming every year , you could survive quite easily on your budget of $1,000.00 and there are many apartments in your price range . I know ( kind of ) a young lady who has a humungous apartment with built in oven and the whole nine yards , cost to her is $200.00 a month plus utilities , furnished,and very close to a lake . Sihanouk-ville in the south boasts several beaches with good swimming in warm water , one is almost deserted but with food etc available and the water has practically no efluent discharged into the water which is more than you can say for most asian beaches , especially Thailand .
This is a strugling nation so you need not be looking for the Ritz or 'Pristine 'anything . Visa is renewable every 6 months , at this time for $160.00 . The riverside in Phnom Penh is a haven for more monied foriegners , but meals can be had for $3.00 or less , if you eat 'Native 'meals are around a $1.00 .This is a none rush , laid back society where your nerves will not be frazzled on a daily basis , but it will take a little adjusting . Colin