Well, aside from the stuff I mentioned in the rules above I'd say: be willing to work on the plot with me, post on a somewhat regular basis, I would love at least one post per day, but I get that doesn't work for everyone so I'd be happy to get a few posts in every few days. Tell me if you're not interested in the RP anymore, or if you'd like to change something or of you aren't happy with something I've done. I prefer to discuss things and make it so everyone is happy, instead of a partner just vanishing from one day to another because they aren't satisfied anymore. Communication helps a lot with creating a good RP, in my opinion. Which doesn't necessarily mean we have to talk about ourselves, if you're a private person, that's fine of course. Usually I'm looking for a long-term partner, but right now I don't really mind either way.
Does that answer your question somewhat?