routing for class methods in bottle frame work

from bottle import Bottle, template

class Server:
    def __init__(self, host, port):
        self._host = host
        self._port = port
        self._app = Bottle()
        self._route()

    def _route(self):
        self._app.route('/', method="GET", callback=self._index)
        self._app.route('/hello/<name>', callback=self._hello)

    def start(self):
        self._app.run(host=self._host, port=self._port)

    def _index(self):
        return 'Welcome'

    def _hello(self, name="Guest"):
        return template('Hello {{name}}, how are you?', name=name)

server = Server(host='localhost', port=8090)
server.start()