The flat is in a great location in barrio alto if you want to explore the nightlife.
If you are staying on the weekend then make sure to bring earplugs as it can be a bit loud when you are trying to sleep.
The flat is in a nice old building, but because its an old style flat its very small. Especially one of the rooms, it just has enough space to place a suitcase on the floor.
Check in was very easy and helpful with all the questions we had.