First things first: the location is pretty perfect! Right in the heart of Riga Old Town, next to roads where taxis can enter.
I booked a single room to kill time and rest before a late night flight from Riga. Easy booking and check-in. The reception was friendly but nothing extraordinary - usual Latvian style.
The "single" room had two single beds and a bathroom. Everything was clean upon arrival. Towels and sheets were clean. Overall, for the price 39€ the room had it all. The room's tv is a small CRT box with a horrendous static sound, so don't expect much entertainment-wise.
If you are travelling on a budget but want to stay in the city centre, the Rija Domus is an excellent option. I needed a rest after a stag party before our late night flight departed, and Rija was perfect for freshening up.
CONS: Note: my friend booked another room, and it did not have its own bathroom. It had a shared bathroom /shower with at least 2 rooms. So be careful with that if privacy is your thing.
CON 2: I could hear my neighbour very clearly. The walls are thin and do not block much.
So if you are in Riga with 18 mates but can't keep up with the drinking on day 3, I recommend Rija as a safe haven.