To send letters you can use the post in Garbejaire, see map below. The good thing is that you do not need to wait in the queue, but just use the machine on the left side. It has both scales to weight your package and touchscreen interface to specify destination. You don't even need change - there is machine that will exchange your bills.


On entering your room you may find out that some things don't work as expected. For example my night lamp would not give any light. But don't worry - the administration will fix it for you. Procedure is simple - just send them an email stating your room number and what's broken. But there's an discomforting thing: they'll enter your room using their own key...
This one is hard to miss. You should see it on your first way to the residence. It's the big Supermarché on the right (when you're heading towards Sophia in a TAM 230). But it can take some time to figure out, that there is a Petit Casino just around the corner*.
This is a nice surprise. If you don't have your own laptop, you're not lost yet. You might get one for free from the university. Of course you need to give it back after the academic year. You also need to give a financial guaranty for it. Still if you need it - go for it.