Yes this is the place where Guru teaches AK singing. Guru used to tell AK to sing Saigal songs as a part of the "Riyaaz"...AK uised to say "Woh to naak se gaate hain, etc etc"...then KK used to insist to sing...AK used to try and fail miserably. Thus AK learnt the good way of singing techniques.
This is as told by AK in a video interview in a tribute to KK