Our stay in Riga was great. The apartment was easy to find (we took a bus from the airport and walked from the bus stop), and the instructions were clear for check in. The apartment was right in the heart of the old town so perfect for getting around.
As other reviews have mentioned, we were kept awake one night by the sound from the bar downstairs, but the apartment is soundproofed as much as possible/windows are double glazed and there were earplugs provided. We were woken in the morning by church bells from right outside too (I quite enjoyed this, made a change from the building noises we experience in London) think it would be much worse in summer and we weren't too worried but if a silent night sleep is what you're after then it might not be the best pick.
I think the place could benefit from a couple of extra pillows.
The apartment was very clean, spacious, warm and had a really nice feel to it. We would stay again if we came back to Riga.