We spent two weekends exploring Pittsburgh this year and we plan to return for more. During the most-recent visit — in mid-July — we crashed at the Ace Hotel in the slowly gentrifying East Liberty neighborhood. There, the century-old YMCA was reimagined as the Ace Hotel not quite two years ago. A boutique hotel company, Ace is becoming known for its creative approach to creating community spaces that happen to be hotels.  Like most hotels the public space has a bar, restaurant, ballroom, but it also has the old YMCA gym where guests can play ping-pong, corn hole, basketball or attend organized yoga or a dodgeball games.  At any given time at least one person is punching a laptop keyboard at the communal bar table. Meanwhile, room décor…