I chose Elena and Philip's place because they are both teachers and seemed prone to nice exchanges. My experience overall was great. Elena is very helpful and gave me tips and maps so I could get to know the best of Milan on a cheap budget (she has lots of tips). I wouldn't have gone to half the places I went if it weren't for them. Their home is quiet, well decorated and clean, exactly as you can see on the pictures. The private bathroom is also a pretty good thumbs up.
They are a very charismatic couple and Philip in particular likes to engage in conversation and share cultural exchanges. I had long hours talks with him in which I could learn a bit of Italian and also get to know more about american and italian society. It was enriching :)
The only advice I would give to the next visitors is to try and not get in their way. They work a lot and sometimes I felt I was intruding their space unknowingly. Sorry for that. Being aware of this, you should definitely stay with them.