As in previous comments, Daniel also picked us up with his motorcycle and led us the way to his apartement (and to a parking space. lesson learned: never go to Lisbon by car!!). The apartement itself was clean, the bathroom is the smallest we've ever seen - but does its job for a few days ;) - unfortunately there were road works in the streets, which we didn't know about. If you consider this apartement, consider that Bairro Alto can be very lively during the night ;)
Over all, it was a charming portuguese apartement which we liked and would recommend.