This is the Kaweco Sport and it may be my number one tip for anyone who wants to buy their first cheap fountain pen. It is cheap, it has a great 30's design, it writes well and it comes in a bunch of different colors so there should be one that matches your style. If you like it you can even get a couple of pens in different colors to match your different outfits.
Sure, it's not a super classy pen, but for a first fountain pen I would say it's perfect because of the reasons mentioned above. Another great thing about the pen is that it's made of durable plastic and has a secure cap so you just can throw it in your bag without thinking to much about it.
My Kaweco Sport on the pictures has a nib in the size fine which is perfect for taking notes in small notebooks or if you generally write small. I would however say that for most people a medium sized nib would probably be better as it writes more like most "normal" pens. A broader nib also shows of your ink of choice way better so if you like showing of all your cool ink that is also a better choice.
But now to the "bad" part. As the pen is so small it is made for using cartridges of ink and not ink from bottles. The boring thing about that is that cartridges really limits what ink you can use. You can buy what is called a converter to the pen, which lets you use ink from bottles, but the converter is so small so you will need to refill the pen quite often. But for a first pen I would recommend cartridges anyway as they are easier to use. Even if I really would like to recommend bottled ink just because of the pretty bottles you can put on your desk.
Las but not least, the pen also comes in a very cool looking retro tin box.