First is Ixerin on FurAffinity under the same name, and at DeviantArt under the name Ferahgo-the-assassin.
She's commissioned me quite a lot in the past couple of months, and in my experiences with working with her she has been nothing but helpful, sweet, and reasonable. If you offer to show her your progress, she will give you reasonable pointers and tips on how to improve the sketches, but she is by all means not demanding. I feel that it's extremely helpful, and it lets me know that she will be satisfied with what you finish.
She pays for your art in a timely manner, and is very gracious and understanding about any setbacks you may come across. She is an absolute pleasure to work with, and if she ever comes to one of you guys for a commission, I feel good about saying you won't regret it.
Secondly I would like to mention Dylan Hartness, at Furaffinity under the name Iannaxieas and at DeviantArt under the name Vammtur. He has also commissioned me quite a few times in the past couple of months, and like Ixerin I have nothing but good things to say about my experience working with him. He makes his payments promtply, (and not to mention he is a gracious tipper!) He is very easy to work with - and easy to please (but don't take advantage of this, work your hardest and best as you should!) But also he's just a nice guy in general. And again, if you are ever commissioned by him I have no fear saying you won't regret his business either.
I hope that gives you a small insight on these people, to sum it up - in my experience with Ixerin and Dylan, both of them are just so fun to work with, both are understanding and patient, kind, and great induviduals in general.
Thanks for listening, have a nice night, and I hope you all are keeping warm this winter :)