I've been to Patti's a couple of times and I can tell you its better for lunch than it is for breakfast. Patti's, in my mind, is primarily a catering company. They serve walk-in customers in their restaurant but the main buzz is the catering orders they are preparing for the day. The phone was ringing quite a bit so that's good.
Breakfast however was a bit disappointing. I met with a colleague and had 2 eggs with peameal bacon and home fries. Although we met there at 8:30am, it seems like the bacon and home fries were made much earlier in the day and re-heated. The peameal was dry and the home fries were somewhat hard. My guest had bacon strips that were very greasy. The coffee was good.
This is a good place to meet a friend or business associate for a coffee and discussion or a sandwich and soup at lunch. The interior, albeit it a bit dated, is comfortable with booths and some tables. The table cloths are a nice touch. The owner Patti (Jr. I gather) is present and her ears perked up when I mentioned I had gone to another location called Patti's close by. She interjected that it had closed many years ago. It's always nice to see the owner actively involved in the operation.
If you're looking for a good spot to grab a coffee and a muffin or a sandwich at lunch and you're in the Mississauga Road and 401 area, Patti's is a nice place. The interior is comfortable, the service is good and the value is great. I would give it a better rating for lunch but the breakfast just didn't do it for me. Perhaps getting there earlier in the morning would have been better.