Hi! I can recommend an excellent Spanish native teacher who provides personalized lessons per Skype on a very flexible schedule basis.
She is called Elena Selva
As Skype may prove to be a “weird” channel, what she normally does is to provide a free-of-charge lesson to a potential new student to make sure he/she feels comfortable with this system.
Further, as I said she provides “personalized” lessons, i.e.: she has a folder for each of the students where she gathers specific information on the student, such as: objectives, performance, common mistakes, and so forth. This way, she makes sure there is an learning evolution.
I believe she’s got a great approach…in fact, I am looking for something similar for myself in German, 
Hope it helps!
Regards,