Hopper interview questions

I contacted them via their website and soon I got a reply. They asked me to solve a simple coding problem and after that i was invited to their office to speak with their lead. Their office was on the street where I would be scared to come home late and the building was covered in graffite so I started to have seconds thoughts there unfortunately... When I saw him for some reason I thought that he don't want to hire me(or maybe he was tired), but he was very nice anyway. I didn't get many questions about the position, the guy just talked about the company and what they do and then asked me to solve an another simple coding test. I didn't have enough time to finish it. It really felt like too fast. After that they contacted me and told me I didn't pass without giving details why. I really think when I was on the interview they have already got someone else in mind. But aside this I think it was an ok interview