Unlike a themed party, at a housewarming there shouldn't be a lot of loud decorations. The house should look clean and elegant.
Set up the snacks, buffet style, on a long dining table. Place a table runner down the center of the table. Serve the tapas on clear platters. Make a small nametag for each of the dishes and stick them in placecard holders. Stack linen napkins nearby.
Choose another location for the bar. Arrange glasses, an ice bowl, and the sangria pitcher. Fill a large, decorative bucket with ice, beer, and wine. Light candles and arrange pretty white flowers in low vases.