Thanks a bunch to Yuris! He was very helpful and hospitable!
The appartment itself is very happily situated in the middle of the Old Riga - everything you would like to see or visit is in the same street or just around the corner. The appartment is perfect for up to 4 people. It is clean and light - very comfortable if you are okay with stairs.
Strongly recommend for a stay in Riga :)

Mind it, the stairs leading to the appartment are quite steep, so the only possible reason for not picking the appartment is if you have any movement limitations. Otherwise - don't think twice :)