We had a great time at Christina's. The apartment is located near Syntagma Square in a nice and quiet building.
The place was very very clean and had all the things we needed. Suitable for couples.
The communication with Christina was fast and informative and check in/out was very easy.
The only downside was a very slow wifi. So if you need to work from the apartment, take that under consideration.
Great value for money. I fully recommend it.