Guild Guides have all kinds of important information about the studies at Aalto and about living in Finland. Guild Guide 2018 also includes the schedule for the first week, so this is a good thing to have with you for orientation.
Older Guild Guides:
Here is also the Freshmen Guide written for the new Finnish freshmen. It’s all in Finnish, but it does have some interesting articles and information that could be useful for Finnish students starting their masters as well.