Is it trustworthy? It's a car ride that's less than 20zl!
It's a place where just private people driving between cities announce that they have free seats and they can take others on these free seats for the proposed price. Like eBay, but for car rides :-). They have a rating system, so if you choose a driver with good rates (read also the opinions), everything should be good. I haven't heard about problems with this. You can see what kind of car the driver drives (also the color - might be important rather for women), you also can read some opinions, for example whether he drives calmly or aggresively etc.
Bus ticket price will be comparable or lower.
I am more of a chilli person so my stay here without chilli is quite depressing for me.
For most of us in Poland so spicy food is just too hot and difficult to eat. Some people like this, but many - not. I think if you say you want it very spicy, they will know what to do.
Whereabouts in Chorzow Paul?... Could be wrong:)
I think Kraków may have more polluted air. It's not only the matter of the industry, but also the cars in the city, and in winter - also lack of connection of many houses to the city heating network (so they must heat themselves locally and generate pollution in the city). And Kraków lays, basically, in a hole, which results in the pollution concentrating in the city.
Although I believe that in the countries like Singapore it's not much different.
A good advice with the lake, especially in a good weather!