After a large quantity of gelato from Papagiorgis, I walked into Solo to look around and compare. Even though I couldn't stomach another one, I made a mental note that the place looked authentic with silver tins (albeit open).
I went back the next day to try it and even though it was more expensive for a smaller amount (but easily enough for 1), it was clearly a superior product and good enough for me to return the following day too.
The mango sorbet was thick and tangy. The pistachio was hidden underneath (don't know why considering they advertise they use Sicilian pistachios) and had a good colour and reasonably good flavour. It costs 0.5€ extra for one of those thick chocolate sticks which was pretty unnecessary in the end. They also tried to put liquid chocolate on top, to which I said no. I have to say that probably downgrades their product a little even offering it.
I tried the chocolate the next day (with pistachio again) and that was pretty good too.