Knowing that Iberia had a rather doubtful reputation in the past we did choose this airliner because it was the best option for us.
Must say that all went very well, the booking, the price (!) the cleanliness of the plane, the staff, the punctuality and the seat comfort, BUT, note that we had booked Economy Comfort, means XL seats.
Two legs flight, Brussel to Madrid and then to Fuerteventura.
Madrid has a great airport, we could find our connecting flight very easy, the same when we returned.
Have booked already to Gran Canaria for next June :-)
PS : I'll copy this review to the IberiaExpress reviews because second leg was With IberiaExpress.

Worst airline I have flown with. They over sell the flight then don’t let you check in online the day before. When you get to check in at airport they put you on standby and say you have to hope no one turns up for the flight. Stressful and not acceptable. The airport staff are all unhelpful and rude, evidently working for this airline and dealing with the torrent of customer complaints is a miserable task.

The flight was delayed and then the ground staff was very rude, snappy, and abused their power. Would never fly Iberia again.

Customer service was very helpful. In flight entertainment had many options to keep busy throughout the flight. The seats were very comfortable. The only downside was do to a tight connection they lost my luggage. Lucky it was found and delivered to my hotel 2 days later.

Don’t you fly with this airline unless you your entire reservation screwed up. The pilot arrived 20 minutes late to Dulles and got the the connecting destination late. Leaving about 15 minutes to make your connecting flight. Oh let’s not forget the cabin door close 15 minutes early.

Get to the gate the lady say flight is over booked and completed go see customer service. This is at MAD airport. 20 passengers were sent to lberia customer service.

The lady booked me for a new flight and say my return flight is suspended. And she just has no idea why and states to call airline. Spent hours on phone with British airways and Hotwire. British airways says you were put in as a no show. I explain to them not true me and 20 other passengers were told we can’t get on.

They raised my stress level extremely high. Some many things went wrong. Did they lie about the no show and over book. Don’t do it. A disappointment awaits your future and spending extreme money to book return flight.