I stayed at this apartment with my wife and three kids.
The location is convenient, and the apartment is very much as described in the pictures. While it sleeps 6 (in beds), it is not ample.
The kitchen is very small (not ideal for cooking at home).
I found it annoying that Serennia expects guests to procure everything from a dish scrub to garbage bags, even for a short stay.
Having said all this, Alberto from Serennia was very responsive and helpful.