I've been renting my own apartment for years - but if I wasn't I would be staying at Two Guys Guesthouse.
Spacious rooms - cleaned daily, free WIFI, great breakfasts ( I enjoy breakfast there every day without exception), which are free for guests. TG's is on Soi Yensabai - just a short stroll to Sunee Plaza. Here's a link to their website.
http://www.twoguysguesthouse.info/