OkiDoki is a good service center!!! I repaired a laptop, a vacuum cleaner and a hair dryer under warranty. Everything is fast, clear and without unnecessary questions. Professionals work.
They also have a sale of components for laptops.
Good location, close to the metro.
As in any similar institution, you don't have to do it once; if you're lucky, everything will be repaired, if you're not lucky, they will always find a way to move out and send it...