This week ihas beingen really hard for me, I'm not used to getting up early yet and I'm missing wakeing up at the time I want.

I would use “has been” here. In general, this is how I see it expressed most frequently.

If I were to explain why: the week is not over yet, and the first days of the week were hard. Since, I am still progressing through the week, I say it “has been” hard.

Because of this, I'm taking big snaps after work, like a good Spaniard :)

This week is being really hard for me,. I'm not used to getting up early yet and I'm missing wakeing up at the time I want.

Because of this, I'm taking big snaps after work, like a good Spaniard :)

Also correct:
Because of this, I'm taking big snaps after work, like a good Spaniard should :)

Because of this, I'm taking big snaps after work, like the good Spaniard I am :)

In summarFinally, I've spent the afternoon sleeping and watching Rick and Morty.

Use "In summary" to say what you have already said before. "In summary" doesn't work because you said new information instead of summarizing previous information.