Just to update this thread a little for anyone looking for info on this topic: I'm at Langue Onze in Toulouse now doing a four-week course and my experience is the same as hettyvh. I feel like I'm making almost no progress here. Our class mostly involves listening to the teacher talk endlessly about grammar and repeating herself a lot and boring everyone senseless, then we do a few basic exercises with very short answers. There is virtually no real speaking practice and no writing exercises at all except homework, which the teacher doesn't even check the next day half the time. One of the worst things is that the teacher seems to be very unresponsive to the students - she just goes on and on with her explanations, long after everyone in the class has fully understood what she's getting at. She doesn't adjust her teaching to suit the class at all, she just seems to be on autopilot a lot of the time.
The teaching quality at Langue Onze seems to vary hugely depending on what teacher you get. I've heard that another teacher there is even worse than the one we have now, but at least two teachers seem to be a lot better. But you have no control over which teacher you get. They do rotate the teachers somewhat from class to class, but we've had the same (bad) teacher for three weeks now. Last year I did a 4-week course at a different school elsehwere in France and there we had a different teacher every week (and every single one of them was better than my Langue Onze teacher now).
The school has other problems too: the wifi doesn't work all the time, the admin is somewhat disorganised, and some class time is lost every day because of people turning up late.
Alliance Française is a LOT cheaper than Langue Onze, and although its classes are usually bigger, I have heard from people who have been to both that the teaching is better there on average and you learn a lot more. They also offer more optional afternoon classes for extra practice in speaking, writing and pronunciation - these classes cost a little extra, but the total is still less than what you'll pay for just the basic course at Langue Onze. In other words, Alliance Française is a much safer bet in terms of value for money: you pay less without so much risk of being stuck with a crap teacher.
Having said all that, Langue Onze might be okay for beginners (A1 and A2 level) because at that level you probably need more explanation of grammar and not so much speaking and writing practice, and the smaller class sizes might be more significant at that level. But for the more advanced levels (B1, B2, C1) Alliance Française definitely seems the way to go if you want to learn French in Toulouse.