Stay in luxury Airbnb with all mod cons for less than $700 per month. Eat for less than $5. It’s clean and has everything you need, including great supermarkets and restaurants. Stay away from KL if you want history etc, but if you’re an expat this ticks every box.
SLOW internet speed and local people mostly relies on 4G/LTE networks instead of cables. However, I need to recommend the Wheeler's: https://goo.gl/maps/Z2cLP2y9hqT2 It has the fast internet speed in town, around 20Mbps download/upload.