I am not learning Portuguese at this time, but Spanish. Even so, I have been thinking that the two are similar enough that I could attempt at least some Portuguese. I usually select my target languages by how regions / people it can potentially help me to communicate with, and Brazil is truly vast on that consideration.
Regardless of that I could still help you with English, with the declaration that I am not a native English speaker, but a proficient one. If you are seeking to improve your fluency, it will be helpful. If you want to acquire a specific area native pronunciation (UK, US, Canada, Australia), it will not. Once a week should be possible for me.
There is also the matter of time zones. If you are on Brasilia time (UTC-3) then there is an eight and half hours time zone difference between us. As I write this, it's nearing two AM in the morning at your place. Scheduling will be relatively difficult but not impossible. For example, my Spanish teacher is on twelve and half hours time difference with me. In case you are still interested, you could send me a message.