If you havent booked your hotel yet or want to save and can still cancel your hotel, a very kind Montrealer is offering accommodation on their spare bedroom. For privacy reasons, ping me and I will forward you to them.
The location is approximately ~30 min away from Netdev conference via public transports - but not to worry about getting lost your host is going to the conference as well.
The hosts are offering bed and breakfast to one person (or 2 if they sleep in the same bed). They have a cat and a dog so cannot accommodate people who are allergic to them.
cheers, jamal