The last time I was in South Goa, that was Palolem (Canacona), a few months ago, internet was very stable. But there was an instance of power loss, once or twice, though not frequently, and not for long durations.
Besides, every cafe that I went into had fast speed WiFi installed and power plugs.
When it comes to accommodation, I think you will better off staying at AirBnbs and private rooms. I will recommend against staying in hostels, because most of the visitors were there for partying and not for work. Hence, loud music and a hustling environment, not friendly for work. If you are 4 people, you can find a private villa or a house and divide the costs among yourself.
Food is very costly in Palolem. I think this is the problem with tourist places now turning into workation zones. The menu cards have been designed keeping the tourists in mind, not long term stayers.