Double (association football)

Columns: Club | Country | Number won | Year ( s ) won
Celtic | Scotland | 1 | 1967 * | Hamburger SV | Germany | 1 | 1983 | Steaua București | Romania | 1 | 1986 | PSV | Netherlands | 1 | 1988 * | Red Star Belgrade | Serbia | 1 | 1991 | Milan | Italy | 1 | 1994 | Porto | Portugal | 1 | 2004

Example questions:
What is the current stadium of the team on this list to first win the European double ? | The Netherlands club on this list with the fewest doubles is from what city ? | The club with the most doubles was founded what year ? | The German club with the most doubles added what player after the first week of their most recent double-winning season ?

Answers:
Estádio da Luz | Eindhoven | 1899 | Javi Martínez