In Bucharest you can find plenty of bars, pubs, rooftop bars and restaurants, but on a summer day, what I love the most is a (hidden) garden where I can relax, have a refreshing drink and enjoy great music.   Here are my top choices of the greenest summer bars in the city: Sera Eden   Located on  37 C. A. Rosetti street, the large green place is almost hidden behind the fence that doesn’t say too much about what you’ll find once you walk in. If you don’t pay too much attention, you can pass by and actually miss it.   Sera Eden is in the courtyard of a mansion, which formerly…