We went to about 4 other places before staying at Asta's place, and we had different experiences, however Asta's place was by far the best in terms of deco, and well thought touches they made to their place.
Even the noise on the streets was not an issue becuase they have installed thick window panes that reduced the sound significantly, there were also earplugs that they supplied.
I would suggest their place, and I will go there when I go back to Istanbul.