This is a diffcult question to answer because it depends on many factors. Of course, the teacher is going to say, “as many as possible!”, but in reality, you can make any number work. Many of my students only have time for one class per week, and this is fine if you supplement your learning with out-of-class activities. 
Other students need more frequent lessons because they’re eager to learn quickly, or perhaps have an exam coming up.

It’s true, there are websites and teachers offering their time for much less money. Honestly, I don’t know how they survive on such a low salary. But I do know that the quality of the lessons is directly connected to the price that you pay. 

Certainly. I’ve done this for students from undergraduate to doctorate level. Contact me for more information.

Of course. I have helped students pass all of the Cambridge exams (First, CAE, CPE) and IELTS. I don’t charge any extra price for exam preparation, including written assessments. 

You can, but I recommend using a computer or a tablet, at least. If you have a good phone, with a big screen, you might be able to see all of the content that I’ll share with you. I use the technology to make the classes richer, not just to chat.

Becuase of my time in Uruguay and Spain, I speak some Spanish. This definitely makes working with Spanish speakers my speciality, so I’m very familiar with some of the common problems these students have.

This is something that I don’t recommend doing. For the occassional piece of vocabulary, translator can be a useful tool, but relying on your 1st language to learn another one is not a good long-term strategy. Many students experience an ‘intermediate plateau’, where improving past this level seems impossible. One of the many reasons for this may be the over dependence on translating everything in order to understand, instead of associating language to concepts.
I absolutely understand that this is something easier to say than to do, but we have to try, right?