Formal:
* C'était bien. (This is the most common and neutral way to say it.)
* C'était agréable. (This emphasizes the pleasantness of the experience.)
* C'était excellent. (This indicates a very positive experience.)
Informal:
* C'était cool. (This is more casual and suggests that you enjoyed it.)
* C'était top. (This is even more casual and means "it was great.")
* C'était pas mal. (This means "it was not bad," but it's often used to mean "it was good.")
For food:
* C'était bon. (This is the most common way to say "it was good" for food.)
* C'était délicieux. (This means "it was delicious" and is used for something you really enjoyed.)
* C'était succulent. (This is even more positive and means "it was succulent.")
You can also use other phrases depending on the situation:
* J'ai bien aimé. (I liked it.)
* J'ai trouvé ça bien. (I found it good.)
* C'était vraiment sympa. (It was really nice.)
Remember to choose the phrase that best suits the context and the level of formality you want to achieve.