The Botanical Garden ideas set is just delightful and looks really good, inside and out. The little plants inside, the cafe, the different techniques used to build the interior, the balcony, and of course, the white wrought-iron frame is really nice. The story lines made by the various minifigures are also very funny.
The only drawback from this set would be the base - it takes a long time to build up the base of the structure, making for some tedious building at times.
This set is BIG as well - two full base plates - making it the complete package for your city, but make sure you have enough room for it!