Help Any Good Short Japanese Courses in Tokyo?

Hi, I'm looking to study Japanese in Tokyo for around 4-6weeks and was wondering if anyone has any experience and/or recommendations for courses in Tokyo.

I'm looking for courses that are at least 3 days a week and don't want to spend more than $1000 / ¥100,000 preferably closer to ¥70,000 or less.

Does anyone have experience with any of the following?:
短期コース | 新宿御苑学院
Tokyo International Japanese School/Lesson
コース案内｜国際アカデミー日本語学院 池袋校
SCHOOL ENROLLMENT INFORMATION FOR NON-JAPANESE RESIDENTS Procedure for attending short term course (1-3 month) UNITAS Japanese Language School
Roppongi, Tokyo - Japanese language school - UJS language institute -
One-month course | Shibuya Gaigo Gakuin
2 Days a Week Course - Evergreen Language School

Thanks for your help.