hi thank you so much for your response! Can I ask how you chose your language school through GoGoNihon? I looked through the site and there's so many language school options to choose from. I don't have any specific preference on which city I want to be in either which makes it harder to narrow down my choices.
I already had an idea what area I wanted to go to (Osaka) so I only had a few choices, and the one I originally wanted was full for the semester I was applying for so I really only had one choice of school (it was the only part-time school out the the 4 or 5 so it ended up being the best choice for me anyway).
I would recommend doing a little research on the different areas of Japan where you could go, get an idea of what each area is like and what makes it unique. Maybe one area will jump out to you, maybe not. You can pay attention to things like:
weather--I wasn't too picky about this but the weather here in Japan is easily the worst of any place I've lived--and I've lived in southern Arizona and interior Alaska. I don't even live in a very weather-extreme part of Japan like Hokkaido.
cost of living--big cities like Tokyo or Osaka will be more expensive but also give you way more opportunities for meeting people, practicing Japanese, part-time jobs, travelling, etc.
how extensive and therefore convenient the public transit system is--again, better in cities. If you intend to be out and about seeing the sights a lot and you won't have a car or bike, this is pretty important.
dialect--some areas are more difficult to understand than others, or you might be interested in one particular dialect
access to other areas of Japan--if you're hoping to spend some time traveling to other parts of Japan, you should keep that in mind. For example, from Osaka you can hop on a local train and be in Nara, Kyoto, Kobe, Wakayama, or even Himeji Castle or Nagoya within a couple hours, or shell out a bit and take the bullet train or night bus to literally anywhere else in the country. Southern Kyushu? Not a lot of easy day trips and Tokyo and Hokkaido are suddenly a halfl-day trip one-way
subcultures--I can only speak for Kansai but there aren't many opportunities for hobbies like ballroom dance class or LGBT events outside of Osaka.
If that doesn't help, look at types of school. There should be an indicator on gogonihon for how intense the school is. Full-time vs part-time (half-day classes) is also probably be going to be a big decider for you. Again, depending on what you want to focus on, classes might not be the most effective for you, in which case part-time school is probably the better bet.
All of the schools that I'm aware of work on a quarter system, as in 4 terms per year, so the next one will starting in March/April (might be impossible becasue of Covid), and the next one in June. If you're planning on applying for the next semester at any given time, have a few schools picked out, since one may be full. If you've got a full semester or more between the time you apply and the time you want to start, you should be fine though.
Other than that, if you do a bit of research (on areas and schools), you should be able to figure out what is important to you in choosing a city or school and what isn't.
The staff at gogonihon might also have some advice for you once you start the process.