Ok.. limiting myself to that particular website and your budget, here are some amps in your price range that could be suitable for your needs:
1. Roland Mobile AC Acoustic Chorus Guitar Amp
http://www.gear4music.nl/en/Guitar-and-Bass/Roland-MOBILE-AC-Acoustic-Chorus-Guitar-Amp/MNY
This one is very versatile and excellent because:
-Roland amps have great quality sound
-They're built tough
-Can use batteries or an adapter
-Has more than 1 channel (option for mic)
-Reverb and Chorus effects, very handy if you want to vary your sounds
-Versatile selection of inputs and outputs, such as headphones, etc
This one is probably one of the most versatile options if you want a purely acoustic amp under 200 Euros.
2. Fender Acoustasonic 15
http://www.gear4music.nl/en/Guitar-and-Bass/Fender-Acoustasonic-15-Acoustic-Guitar-Combo-Amp/P9O
I can give a very detailed description of this amp, because I actually own one! It's a great sounding amp!
-Plenty of power (for intended purposes)
-Treble/Mid/Bass knobs work very well for tweaking and generating natural sounds. It gives you a more refined control than Roland's single Tone knob.
-Has XLR Microphone jack, which is very handy. It works better than the 1/4 inch instrument input that the Roland has
-Same versatile inputs/outputs (eg: Headphones, mp3 player input)
Disadvantage: cannot be battery powered.
Overall, very good value and performance if you want a simple acoustic amp, and you have no need for battery-powered portability.
3. Vox Mini3 G2
http://www.gear4music.nl/en/Guitar-and-Bass/Vox-MINI3-G2-Modeling-Guitar-Amplifier-Ivory/QQ8
This one is not an "Acoustic amp". It's an electric guitar amp.
Compared to my purely acoustic amps, it is not as well suited at producing a pure, natural acoustic tone. However, if you tweak the settings just right, you can get pretty close (eg: Using the BT Clean or LINE channel).
However, it is a VERY useful amp. I use one myself and this is my goto amp if I am taking an amp outdoors.
-MANY different sound options - this is a modelling amp for emulating many different sounds on an electric instrument. It means hours of fun on your ukulele, getting it to sound like anything. Sometimes it's just fun to go all heavy-metal on an ukulele. There are plenty of clean tones that would work for acoustic instruments
-Built-in effects: Chorus, flanger, tremolo, reverb, etc.
-Can be battery operated - very handy when you are outside
You get a ton of features at a small price. However the con is that it is not designed to be an Acoustic amp, so it won't sound quite as 'natural' as the actual acoustic guitar amps. But that's a small price to pay for the plethora of different sounds you can produce.
4. Roland Microcube
http://www.gear4music.nl/en/Guitar-and-Bass/Roland-MICRO-CUBE-GX-Guitar-Amplifier-Red/TXQ
Very similar features as the Vox amp.
It's a matter of preference which brand you go for, or which set of features appeals to you more.
I used to own a Microcube, before I gave it away to someone who needed it more than me. I now own a Vox Mini 3. I can't really decide which I like better - they're same-same, but different