As you start settling in to your French class, getting to know the group and understanding what is involved in language learning, you will probably wish you could do more than homework and attending class to progress with and use your French.
Some schools are not interested in helping you with this. To choose the optimum school, make sure it offers other activities outside classes. These should be convivial and enjoyable.
Of course, as adults, we have many demands on our time and you probably won’t be able to do as much French as you would like. But having the choice is a huge step towards making a bit of time now and then for enjoying your new French talents.