Nanode21 is running at the moment 6 nodes: 5 with Hetzner (Germany/Helsinki; 3 of them are testnet nodes) and the representative node with Linode in Tokyo, Japan.
Running nodes helps keeping the network in a good shape with benefits for all and - if selected as representative nodes - make sure that the voting process is as decentralized as possible. Up here are some links to check out, the stats display also comparative statistics including other rep nodes.