"The old doctor sits onto the balcony and reads."

Translation: Az idős orvos az erkélyre ül és olvas.

[GerSzej]

Sounds awkward to me: sits onto the balcony.

[Hulk014]

Yes. Even the hungarian sentence is incorrect.

Az idős orvos kimegy az erkélyre és olvas. - The old doctor goes out onto the balcony and reads.

[vvsey]

"Az erkélyre ülni" is also correct. Maybe more commonly used as "kiül az erkélyre".

[carolgoslen]

Hmmm..... I pictured someone sitting on the edge of the balcony. Or maybe a large balcony with a chair on it. Couldn't that be a possibility?

[samyge]

I got a solution but it was wrong in Hungarian
"Az idős orvos ül az erkélyre és olvas."
Possible solutions may be these:
"Az idős orvos ül az erkélyen és olvas."
or
"Az idős orvos kiül az erkélyre és olvas."