Tarkarli is about 35 kms off the NH 17 from Kasal just before reaching Sindhudurg town. The route to Tarkarli from Mumbai is pretty straight forward as one has to follow the Goa highway for about 400 kms till Kasal. The best way to reach Tarkarli from Pune is via Kolhapur, the best route to reach NH 17 from Kolhapur is via the Gaganbawda ghat.
About 30 kms from Kasal will get you to Malvan. Once you reach Malvan, you need to take the left turn from 'Barad Naka' and follow the road towards Tarkarli and you will find Namrata Nivas on your left just before you reach Tarkarli.