I stayed at Mosaikon for 5 days. The hostel is not like your typical hostel, it has a feel and service of a hotel. I stayed in a 4 bed female dorm with a private bathroom and the beds were comfortable, you had room to sit up and read and curtains to maintain your privacy when sleeping. Housekeeping cleaned the romms everyday. They offer a laundry service if you need any clothes washed, which is helpful if travelling for long. On the first floor you have a kitchen where you a cooker, microwave, kettle, coffee maker and fridge. Perfect if you want to prepare your own meals. I chose to have breakfast and you your choice of hot beverage made for you, with boiled eggs, gronola and yoghurt, bread, ham sandwich, scrambled eggs, Greek pastry and croissants. There is also freshly squeezed orange juice available too. The fifth floor is their roof top bar where you get to enjoy the view of the Acropolis lit up at night. The bar was not open whilst I was there, but can imagine it being a great place to meet other fellow travellers. The staff are all helpful and would like to say a big thank you to Kuriios. He always greets you with a smile and was so helpful in giving his recommendations on any trips from Athens and how best to get there. I ended up going up north to Kalambaka to see the Meteora Monasteries. I would highly recommend to anyone visiting Athens to plan a trip to see them. Mosaikon is in walking distance to all major sites and the area Monastiraki has plenty of restaurants, bars, coffee shops and shops to explore. I have no doubt you will enjoy your stay here with the friendly service and great location.