Hoping to visit Loftus Road myself in a couple of weeks. Looks a nice, tidy ground.
Saw games at Selhurst Park, Upton Park, Craven Cottage and the Emirates last season. Craven Cottage offers the best match day experience in London in my opinion. Selhurst Park is a bit of a kip of a stadium in a dodgy enough area, but the Palace ultras create a great atmosphere. Real sport, real people down at the Palace. A world removed from the sterile experience on offer at the Emirates, although the football is slightly better at the latter. Upton Park was a bit underwhelming in truth, both on and off the pitch.
The ground I am looking forward to visiting the most is Griffin Park, hopefully in September. Terracing behind the goals and apparently the only ground in England with a pub on every corner of the stadium. A pre-game pub crawl could get messy but it has to done.