Our sibling blog has covered a few years ago about this temple. You can check its permalink here. Yesterday evening I chose to visit this temple. The route I took to this temple was from Ambattur after work hours.
I chose to take a bus to Ambattur Industrial Estate and from there I was looking for a bus to Red Hills. Only a bus to Puzhal was there. So took that bus and after getting down at Puzhal camp, took the next bus from Poonamalee to Red Hills. From Red Hills I took the bus to Thiruvotriyur which takes us to Madhavaram/Ponniammanmedu/Kanakan Chatram. Interestingly this is the same route which goes from Puzhal camp to Red Hills. But the downside of catching the bus at Puzhal is you will end up standing in the crowd through the journey unlike getting a seating accommodation if you board the bus at Red Hills.
After getting down at Kanakanchatiram, you can see a petrol bunk in the opposite site and take the road next to it. I think it is called Big Street. After a few feet walking down, you can find a lane called Vinobhaji Street which is the one that houses the temple.
The time when we went they were doing evening poojas (Saya Rakshai). After completing of the same they allowed us for darshan of the temple. The unique feature of this temple is that Narasimha is in standing position. There are also other sannidhis like Naga Narasimhar, Chakkaratathazhwar (with Narasimhar), Hayagreevar (behind main sanctum sanctorum on the wall). There is a shrine for Andal and Ayyappa too.
The return journey we took back to Red Hills which was a good transit point for a comfortable journey though it takes 20 to 30 minutes more than getting a bus at Madhavaram bypass intersection.