Is it o.k to use me da to ask for something,sounds a bit impersonal even with per favor.
Give me the keys to the house Please.
There is another option using "me da". If I´m asking for something, this form is always used as a question: "¿Me da las llaves, por favor?" or "¿Me puedes dar las llaves?" or "Podría darme las llaves?"
Actually, you would say something like "Dame las llaves de casa, por favor." I don't see anything impersonal about it.
If you are using usted with the person, you would say: "Deme las llaves de casa, por favor."
Me da = he gives me / you give me (usted form -- statement)
Me das = you give me (tú form -- statement)
Dame = give me (tú form -- command)
Deme = give me (usted form -- command)