I have couple restaurants to recommend. Gustazo Cuban Kitchen & Bar (2067 Massachussetts Ave, Cambridge) and Boston Burger Company (37 Davis Square, Somerville).
I've recommended Coppersmith on my page- they've got a great atmosphere. However, there's also City Tap House Boston (10 Boston Wharf Rd, Boston) which has great outdoor dining, particularly for slightly colder nights since they've got cozy fire pits that you can sit, chat, and eat around.