25-year-old girl looking for accommondation in Madrid

Hola, I'm a 25-year-old agronomy student coming to Madrid for an internship, from April 2021 (would arrive in the week after Easter) and would stay till mid-July, so 3 months in total.

I'm looking for accommodation up to 450€ with all expenses included, preferably close to stops for buses 352/353- Ronda Atocha or Conde de Casal. 

I am a positive, communicative and friendly person, who loves to meet new people. 
I enjoy traveling, food, drawing, and photographing.
I'm also a smoker, so if it is a non-smoking apartment, it would be nice if it had a terrace/balcony (even if smoking is allowed inside, a terrace is always a plus).

That's it for me, if there is anything else you would like to know, feel free to get in touch!