Please, advice me a good decaffeinated coffee for espresso and espresso-based beverages.

You may try Lavazza Dek Espresso Pods. This coffee is made from full-bodies Brazilian and sweet Asian varieties. My mother cannot take caffeine and I always buy her these pods. She makes quite creamy and aromatic espresso with them.

Note, that you can use espresso pods only with paper pod espresso machines.

OK, but it looks like I can also use my machine with special adaptor for paper pods.

Sure