Tongzhou

Dio Café
Yunjing East Road (云景东路)
Liyuan Metro Station, exit B, walk a bit northwest along Jingtang Highway, turn and walk 500 meters along Yunjing East Road, it is on your right

Modern café with both Western and Chinese drinks and food. However, the staff is not familiar with the Western stuff, and you seem to get the same coffee regardless of what you order.