I learnt on them and now teach on them at a club with two C150s.
I used to fly one with manual flaps. I liked them , but getting 40 degrees down was difficult above about 70 mph, but it handled nicely down to 55mph for a precautionary type landing. They have no flap position indicator other than the lever position, counting the notches or looking out of the window.
The "newer" ones have a switch that is spring loaded between down and off, but will remain in the 'up' position, and can easily be knocked into 'up' after lowering flaps. Most students do it some time and are initially confused that their approach speeds suddenly rise to 90-100mph. Their is a flap indication on the LH wing root.
We teach 20 degrees of flaps on base leg and 30 on final, speed stabilised at about 70 mph aiming for 65 over the hedge and 60 for a full flap precautionary approach or performance landing.
Go around is:
Carb air cold and full power.
Arrest the descent
Raise flaps to 20 degrees (from 30 or 40)
Put the landing area on your LH side,
climb away if speed >60 and after take-off checks as normal departure.