We were surprised by this review, especially after your reassurance that everything was fine! 
We are sorry that you had such a bad experience. The fact is that the majority of our reviews in Happy Cow and Google say that we have “the best vegan gyros in Athens”, “very friendly staff”, “big portions” and “fair prices”. We certainly get it, that taste IS subjective and thus we cannot be likable to everyone. We always consider the feedback from the reviews in order to get better. We believe that the comments “dry-slightly burned food”, “nothing like the pictures”, or “not much vegetables” are not really accurate since we served you in the same way we serve all our customers. But even if there was an issue with a dish, we would be more than happy to fix it for you, if we were informed.
About the unavailable products, you are right, there were a few. You were unfortunate to visit us one day before our closing for summer. We will be closed for 35 days, so we decided to minimize the food waste and we discontinued a few dishes the day before. We apologize if that cause you any trouble.
Finally about the “unfriendliness” this was our biggest surprise, since we’ve asked you several times if everything is ok, we even tried to fix you in a different more spacious table and finally left you settle as you felt better. 
The restaurant is self-service and this, sometimes, is mistaken for lack of favor. We assure you that this is not the case. We are a small co-operative company that we struggle to survive in a very difficult economy, whilst we are fighting to educate people about veganism, to spread tasty and healthy choices, to fight for animal and human rights. We have chosen to be a “self-service” place so we can have more time and energy to prepare our handmade meals.
Another issue that may seem unfriendly to some people is when we ask them to pay in advance. This happens ONLY when they pay with a card and unfortunately it is not our choice. According to the latest laws in our country, we are obliged to have the receipt printed on your table while you eat. But when a customer pays with a card we have to make the transaction first, in order to print the receipt (that’s the way most ERP programs work). Otherwise, there could be a huge fine for us. 
We understand that there is language and/or cultural barrier sometimes. We are here to connect with other cultures, to discuss and improve ourselves. We sincerely hope that you will have a much better experience next time!