I lived on the Kasetsin side of Pratamnak for a year. A guy in my building had a very nasty looking scar on his right calf from a dog bite. He was an avid walker. I got chased a few times even on my scooter. But it was their barking in the wee hours that really bothered me. Now I live in Unixx, which has windows and walls that keep out almost all noise.
Another thing I didn't like about Kasetsin, as someone mentioned above, is that it's not connected to the rest of Pratamnak (because of the royal property in the area I've been told). Even on a scooter I got tired of having to go all the way up to Pratamnak Road and then back down Soi 5 to get to the big beach. Cozy Beach is OK but isn't long enough to go for a proper walk. starts
If I wasn't happy in Unixx, I'd look for something in Pratamnak on Soi 4, 5, or 6. BTW, there's a baht bus that stops in the Unixx parking lot.