Traffic is limited ie. they cap you too 10mbit after you exceed 10TB, (you can buy more uncapped traffic ofc.)
And yes the "host" is a very big datacenter, I have one server with them for 3 years, with pretty good uptime. 2-3 outages on their end over last 3 years.
You need to remember that you need to buy additional packages for hardware raid or failover that will cost you about 20-30 EUR - if you need them, still it's one of best offers out there and def. best in Europe price wise.
Interestingly, the 10TB only applies to outgoing traffic. For most people this probably isn't that important but for my current project it's great because the bulk of my bandwidth will be users uploading data and/or me fetching that data on their behalf.
And yes the "host" is a very big datacenter, I have one server with them for 3 years, with pretty good uptime. 2-3 outages on their end over last 3 years. You need to remember that you need to buy additional packages for hardware raid or failover that will cost you about 20-30 EUR - if you need them, still it's one of best offers out there and def. best in Europe price wise.