First of all, episodes were to damn short, it wasn't enough. I can see the point of this short story, however it doesn't make any sense to me. It was the most liked ship by fans of the show and instead of giving them a meaningful ending (which they tried but failed in my opinion) they gave us one of the biggest cliche of all time; "poor boy and rich girl". I think if episodes were longer, we could understand the dynamics better. Also something is different with Carla's face but i couldn't understand (anyway, she is a goddess lol)
Also they didn't explain why Carla wanna leave so bad, maybe she'll be in the next season? We'll see.