This place has to be seen to be believed. It's in an original part of a 100-year-old building, with original stucco detailing, high ceilings (prob. at least 3 meters), stained-glass windows on the interior doors, and a massive tile stove. It's decorated with a jaunty nautical theme, including a stuffed parrot! There's a huge living room, a large bedroom, and a big kitchen. There's a TV, fast wi-fi, and washing machine, but no dishwasher. The shower is ultra-modern and can apparently do immersive rain-shower effects, but I stuck to the plain vanilla.
The hosts were friendly and obliging -- they sent a very thorough guide to how to reach the place, and one met me personally to explain everything. There's also a entire table covered with pamphlets and books on stuff to do in Riga. Central Riga is only 10-15 minutes away by foot, or 3 minutes by streetcar or trolley. The only downside is that the place can be a bit loud when the windows are open (when closed just normal background rumble).
A very cool place with plenty of room to stretch out in.