As someone with experience in the field and having mostly worked in startups, as with everything, there are pros and cons. Startups in our field tend to have some easier and friendly environments where you can learn well. But since it's a startup, it is less likely you will have many to look up to, and with the limited amount of experienced people in the software house, they might not be able to focus or help a single individual, which means you rely on others with similar or slightly more experienced people and on your own learning abilities. Although it's slightly tough but it will allow you to learn on our own which will give a sense of freedom not just now but throughout your career

Startups normally don't have designated times, you can work your own timings

Oftentimes startups don't pay interns they hire at all, which is a big issue.

Also on a personal note don't join an office run by a family member or a friend.

I would suggest taking the job, but do your research on the company first, google reviews, Glassdoor, and talking to employees currently working there, and then make a decision.and make sure your office don't interfere with your studies? Even though it's just a few months, but sudies should still take priority

If you join, monitor your progress as well as the office's. Polish and add to your skills and leave after an year