What is medium to upscale for you? (could be the Marriott or it could be Best-Western) Do you have a budget in mind?What kind of work are you doing? Do you require ability to meet clients or is it a web cam & noise factor?
How long are you staying?
How do you define, "not too far"?
---
Assuming a budget of 1575 (~$50 according to convertit.com), you can stay at the PBR or Eastiny or RG or Secrets or a few others. For a little more you could stay at Tim Boutique.
Without knowing more, I'd probably say Residence Garden as you can have a living room (suite) for a relatively decent rate with the FLB Bar discount and it's not too far from WS. (If memory serves, they upped the FLB/PTalk rate to 1450). Keeper would know more about that.
Alternatives---
Have you considered 2nd Rd from South Pattaya up to and including Soi Diana/LK Metro area?
Areca, Tim Boutique, LK, Pattaya Bay Resort (aka PBR)
Either that or rent a condo. DW has a few on offer so check with him.
**FYI: Right now, LK Royal is on special thru Latestays for 1399. (but outside your Geo requirements)