Armenia

Accommodation:
James & I liked the location and amenities of the Hotel Avia Trans, located really near the centre ($120), but be advised it doesn't have internet in the rooms as advertised.
Restaurants and Nightlife:
There are a bunch of fun places down in the riverside canyon (the Hrazdan), which are fun family places where everyone goes to eat lots of Armenian (read: Georgian/Russian/Azeri) food and get drunk and dance. It's a really fun scene, but shuts down by midnight. A place we liked was called Parvana. Apart from that, on a Friday night, we couldn't find any nightclubs, it's really a cafe scene, which is pleasant during the day, but quiet at night.
Transport:
Most convenient way to get to/from Yerevan from Tbilisi is by taxi, we paid $100 for the ~250km trip, including various sidetrips including Haghpat.