Three parallel stories make this a thoroughly entertaining episode. Howard and Bernadette take the big step towards living together, and their domestic negotiations are funny, even if Howard's inability to escape his mother's influence is fairly predictable.
Leonard and Priya getting back together adds a fresh angle to the relationship dynamics, particularly with Penny now having to deal with her ex moving on. It opens up some interesting possibilities without forcing an immediate confrontation.
The real highlight, though, is the quiet ending with Penny and Sheldon, with Amy joining them remotely. It is a surprisingly sweet moment that shows a more considerate side of Sheldon and gives the episode a lovely finish.
7.5/10: A good mix of relationship comedy and character moments.