Yep, fui = I was = I went. But if there is an 'a' it suggests movement, so the verb is 'ir.' If you were staying there I think it would be 'en el hotel' and estuve -- estar because it was a location. I was at the hotel last night = Estuve en el hotel anoche.
Also ser is used for more permanent characeristics or stayes of being. Like I am Canadian. (Nationality) I am a man. (Characteristic) I am a secretary. (An occupation)
Estar is used for ones location always as you will likely just be there for a matter of time and not permanently.
Okay this is kinda getting annoying haha... can 'anoche' be used by itself? In another question, anoche was used with 'de'.
Ok, I work with many latinos, and they are telling me that anoche is two words. "a noche". What do I do with this? I changed it because they told me it was two and got marked wrong, though I initially had it as one.