Take bus 19 and transfer to bus 23.

1. Find out based on Baidu map query.

Get on the bus at Beihai Avenue Shanghai Intersection Station, take bus No. 19, and get off at Beihai Avenue Shiziling Intersection Station, passing through nine stops.

2. Transfer to bus No. 23 at the same station, passing through four stops, and get off at the People's Theater (Municipal People's Hospital Heping Road Campus) stop.

3. Walk 620 meters to reach the old street.

The whole journey is 6.5 kilometers and takes 1 hour.