Mira and Victor are very nice and polite people and make you feel welcome. The "apartment" is small but as described. Be aware that you share WC with several people. WiFi is not very good though - you can use Ethernet cable for your PC.
The apartment is located in a quiet area 15-20 min walking from Old Town. However, Old Town is not all of Riga - on the very same street you'll find a nice café and a few restaurants. During the weekdays there is a auto repair shop which makes a bit of noise but otherwise it's really quiet.