Nino is a great host, that’s for sure. He is easy-going, friendly, good-spirited and helpful (lightning response 24/7 on a phone, plus lots of tips and tricks about Heidelberg for newcomers). Same applies for his flat-mates. Great people, all of them, make you feel welcomed, and homey, they are just fun to be around. But they also understand and respect if you seek privacy/ quiet moment of your own.
Description of the room fits to what you get. It’s indeed cozy, modern and location is great - beautiful and calm part of Heidelberg, shops close by and public transportation just around the corner!
So, to answer your questions: Would I recommend Nino to my friend - yes. Would I repeat my stay at Nino's - absolutely yes! Nino is a great guy, I vouch for him. You will not regret staying at his place, on contrary, you will be happy you picked him. Trust me; I had a great time at Nino's.