I checked into Euro Hostel during my casual trip to Edinburgh with my friend. It is a makeshift accommodation hostel during the student holidays. Since this is a "Hostel" , you should not expect luxury features like an attached bathroom. The following are my personal opinion:
PROS:
1. Excellent location. Close to Edinburgh Castle market and other historical buildings. If you are tourist, all Day Trips leave from castle market very close to the Hostel.
2. Clean Hostel. Rooms were clean. Toilets were extremely clean.
3. Cordial staff at the reception. They tried to help to the limit of Hostel facilities.
4. Good restaurants, departmental stores ( Tesco/Sainsbury) in the vicinity.
5. Fast Internet.
6. Kitchen facilities available with fridge, microwave, utensils, cutlery available for you to use.
PROS:
1. Since this is a hostel, don't expect towels in the room. You need to either bring it from home or rent at the reception.
2. No body wash or soap. Please bring it from home.
3. Common Bathrooms.