In no particular order (I've no shortage of restaurant recommendations!)
Whaley's- has a new Rosé garden and is situated nicely at yards Park overlooking the Anacostia River
Minibar/Barmini- cute, Instagram worthy drinks. Hard to get a reservation to eat here but it is WELL worth it. A great experience to have
Daikaya/Izakaya- some of the best Japanese in the city!
Momiji- this is my little secret place that I love. Also Japanese food. Very low key
Barcelona Wine Bar- one of my favorite places to eat when the weather is nice. It's located on the 14th street corridor and very lively
Iron Gate- the chef here is a friend of mine and has a fantastic operation. Great food and interesting cocktails
Fiola and/or Fiola Mare - lovely Italian places that are always top rated, with impeccable service
Metiér- if you like French, you'll love Metiér. And the caviar is so lovely!
Mastros- it's a lively steakhouse and the mood lighting is great for dates
If you're solo I love to grab tacos at Oyamel or eat at MXDC, both of which are super electric during happy hour.