Fairly little. Decentralization should take into account how redundant our nodes are, as opposed to how many nodes are there. I suppose it wouldn't matter that much if there are tons of nodes in certain areas or datacenter.
It's also worth to mention there are at least 281 reachable full node which use Contabo, according to
https://bitnodes.io/nodes/asns/?q=51167. Using less popular datacenter would be somewhat better.