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I found this nice playlist of general tips. Particularly I am interested in the first video.

You can clearly see, at about 1:50 that the author is using a value of five in his subsurface modifier. I can only go as up as 6 though, and as a result my shape is not that much smooth.

enter image description here

Is it something on my end, and if yes, how can I make this shape completely smooth?

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    $\begingroup$ Can we see the wireframe of your model? Have you enabled Smooth shading? (Tool Shelf-->Tools-->Edit panel-->Smooth) $\endgroup$ – Paul Gonet Nov 30 '15 at 11:14
  • $\begingroup$ Yes I have enabled smooth shading, by clicking the Smooth instead of Flat from the button on the left as can be seen from the image above. I am not sure if the wireframe will be of any help as there are simply too many white lines close to each other to make anything out. $\endgroup$ – ealiaj Nov 30 '15 at 11:18
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    $\begingroup$ See blender.stackexchange.com/q/2832/599. That said, I suspect the issue in your case is caused by this. Generally you rarely need more than 3 or so subsurf levels. $\endgroup$ – gandalf3 Nov 30 '15 at 11:30
  • $\begingroup$ No problem zeffi. I also added the blend file, thanks for the link. It is a little bit modified though. In any case I just changed the texture values a little bit. $\endgroup$ – ealiaj Nov 30 '15 at 11:33
  • $\begingroup$ @gandalf3 I did not know that. It seems that it indeed makes the shape a little bit more smooth. Since this has an answer, should I delete the whole question or would it be of interest for it to have an answer and remain? $\endgroup$ – ealiaj Nov 30 '15 at 11:38
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Yes, you can use higher subsurf levels by typing the values directly, rather than using the slider.
See How can I set sliders to values outside the limits allowed by their slider?

However in this case it looks like the bumpiness is more likely to have been caused by something like this:
Weird deformation between large ngon and edge ring
To fix it, try adding some supporting geometry.

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