Would definitely recommend Rita's! I did a two day comprehensive course which included a trip to the local farmer's market. We learned a fantastic array of dishes and Rita was more than happy to take requests for dishes to learn. Her knowledge of Goan and Indian food was amazing and I felt very welcomed and comfortable.
Take a big appetite! Breakfast and lunch will be what you make through the day - and there's a lot of it! Rita even packaged up leftovers to take away.
Try to take cash with you to pay for the course (a bit tricky with the current money situation in India), or pay in advance if travelling from abroad, as international transfers will come with a slightly hefty additional fee. Still great value for money though and would book again!