Pros
I am sure some employees are fortunately matched with families they got on well with and neither side encounters any problems, giving the illusion of a well-run company - however BE AWARE that even the Babylangues office has a high turnover of staff and the company will likely cause you far more stress than its meagre wages are worth.
Cons
I honestly can't recommend Babylangues, either as a worker or a client. I briefly worked for Babylangues and whenever I hear about someone moving to France I am compelled to go out of my way to tell him/her to NOT WORK THERE. I even recommend the 'rival companies' or suggest au-pair or hostel work, both of which I have very positive experiences of. Major disadvantages: Poor pay (worked out about 8 an hour despite advertisements stating far more than this), a brief training session where nothing new to me was covered, sent me to start lessons with none of the training/supplies promised. (Why should parents pay so much for this company when their staff are so badly-equipped?) No support, endless paperwork problems including for the parents. No services/social aspect for workers outside Paris. Very few hours. Don't expect real progress if the children don't already speak some English - Babylangues hires unqualified people and blames them if the results are poor. I understand I am bias because of the way things finished with Babylangues. I realised before the end of my contract that due to highly sensitive personal reasons, I would be pulling the plug on my dream of living in France and returning home. Still in tears, I decided I needed to inform Babylangues straight away, to help them find a new babysitter for the family I worked for. Although I had always found Babylangues office staff kind and helpful despite the limited resources they had at hand, I was treated very nastily over the phone. The CEO I spoke with demanded I give reasons for leaving, although this was highly sensitive and I didn't want my 35 dorm neighbours to hear about my personal life. Despite my audible sniffling I was threatened with legal action for leaving my contract early (my answer: this isn't your legal right, and if it were, well, I won't be in the country), and told I need to give 2-3 months notice despite my contract stating just 1. They claimed a shortage of staff although friends of mine had been turned away from the company - a lucky escape. The company contacted the family to tell them they would not let me out of the contract and I would in fact not be leaving the country, although of course I had already told them personally. So what are Babylangues going to do, roll out those hidden bonded labour clauses and imprison me at the airport? As a parent, I cannot imagine that any sensible-minded parent entrusts their child to Babylangues, and that any babysitter feels adequately prepared for this job. Choose a company which treats staff respectfully, trains them well and insures good service for clients - it all runs much more smoothly that way. Allowing unqualified foreigners to look after children through a foreign language has endless possibilites for disaster - the instructor can't properly communicate with the child and resolve their frustrations, or know if they're feeling sick, or understand their needs and interests. It's unsafe and frustrating for your child - also, every time I called Babylangues, I had to try 3 phone numbers and wait about 20 minutes to get through - what if a child was lost or injured? 20 minutes is too long to wait to get in touch. I notice that the CEO of this company has a habit of commenting on all negative reviews to argue with and belittle the reviewer, just see previous reviews for examples. And note that all 5-star reviews seem to be written in the same tone, as if by the same person. Also, criticizing your staff generally implies that you do not choose staff well and don't have adequate screening - a poor reflection on the company rather than the individual. I have also heard that this agency is badly regarded by schools and other employers in Paris (and rightly so)- not a stepping stone to a career in France.