We stayed 3 nights at Diankas place in February. It is really beautiful and very clean. Even things like coffee and tea were being provided. I have nothing I could complain about - we were totally satisfied.
As the flat is in the heart of the barrio alto it is quite noisy with bars and visitors around till the early morning. We did not mind yet light sleepers should bring ear plugs :).
Overall: we can really recommend the place!