It wasn't good experience for us.
The flat is too small for 4 persons. For 2 I guess it can be ok.
It wasn't good to sleep there: sofa and bed are not comfortable, pillows are very thin, and a lot of noise from the street and from the stairs. The bed linen were in stains, but they said they were clean.
I'm not an expert, but black spots in the bathroom look like mold.
I always read a lot of comments from other guests to make right decision, but no one wrote about bad things we saw there. People please be honest.
I think it was expensive for such a quality of housing.
Advice for the agency: sometimes spend several nights in apartments yourself to understand what you need to fix.
But I must admit that the agency responds quickly to your questions and helps to resolve issues.
And you can leave your bags in their oficce after check out for 3 eur per bag/backpack.