i could suggest you do this:

user 1:
  id: 5
  name: angelo
  email: angelo@nivler.com

  key/value:
    ['date subscribed', 02/17/2010],
    ['birthday', 02/17/1990]
    ['unsubscribed from email', 1],
    ['is admin', 1]
    .....

CREATE VIEW users_with_kv AS
  SELECT
    u.*,
    k1.value as 'date unsubscribed',
    k2.value as 'birthday',
    k3.value as 'unsubscribed from email',
    k4.value as 'is admin',
    ....
  FROM users u
    LEFT JOIN user_key_value k1 ON u.user_id = k1.user_id AND k1.key = 'date unsubscribed'
    LEFT JOIN user_key_value k2 ON u.user_id = k2.user_id AND k2.key = 'birthday'
    LEFT JOIN user_key_value k3 ON u.user_id = k3.user_id AND k3.key = 'unsubscribed from email'
    LEFT JOIN user_key_value k4 ON u.user_id = k4.user_id AND k4.key = 'is admin'
    .....

  GROUP BY u.user_id