As I first watched, those two were my favorite pair. They seem to mesh really well and get along with each other and the rest of the villa. Further along, I think I got rather bored of them (still liked them, especially together, but wasn't exactly passionate about them winning or losing. They were just "there" for me).Jon and Hannah are the best, I agree. I think Jon is what Jake tried to be this season and manifested Lib as his Hannah!
The first episode was rather surprising for me because I didn't think Hannah would like Jon, in fact, I thought she would be more rude and snarky personality-wise (I misjudged her based on her style and makeup). Was pleasantly proved wrong when I saw how sweet and relatively drama-free she is/was.