Hi madcatlady & welcome to MF.
This is difficult to answer really, I have never been in August so not sure how busy it is. Also, the apartments between 48 - 59, 148 -159 & 248-259 do have the sun in the afternoon but I wouldn't say they are quiet
Having been there in june this year, none of the apartments were particularly quiet, this was due to stag/hen parties being there at this time.
You may be better perhaps to email them, the reception staff are very friendly & helpful.
As you know we & some others from here are staying there this week so I will ask their opinion too.
Sorry I can't help much more than this