Looking for 1 amazing roommate in a nice 2-BR

Hi! I am looking for a roommate or possibly 2 for a 2-BR, third-floor condo in a nice quiet neighborhood in Belmont, next to the Star, several restaurants and a plethora of gorgeous dog-friendly parks. The place is a couple steps up from typical post-college shared housing (see pics, not my furniture but the walls and views are the same), comes with off-street parking, laundry in basement, and utilities included. Pets are welcome, pending discussion as I can't say I'm ok with every species up front. kids are ok, I love them
What I am looking for: I've lived with roommates of both genders my whole life and have a good idea what I want. I want both of us to actually enjoy living with each other - if given a choice, we prefer being roommates to having a nice place to ourselves. This means we communicate well, have a high degree of trust, and have compatible (enough) personalities and living styles. This does NOT mean we expect to be best friends - being at home means first and foremost that you can rest and relax in whatever way that means without some sort of social obligation hanging over your head. But, when things are otherwise ok, we'd have fun chilling together. I'd encourage having friends over for games/movies/eating sometimes or occasionally as it's awesome to have community and I want to be awesome, and live with the same.
About me: I'm 45, an engineer who has lived around Boston for 25 years. I'm typically pretty quiet at home or I'm out (half to most weeknights), but when I'm rested I'm a funny, nerdy extrovert who takes circus classes. I give fantastic unsolicited advice but know when to shut up also :)
About you: Mature yet fun. I don't care how old or young you are as long as you know how to treat people with respect (which extends to things like understanding how your clutter or mess affects the usability of a space to others, for example). You don't need to have 100% of your **** together all the time, but you know how to get it together when needed without complaining *too* much. You can be super quiet, introverted, or not, but please have some personality when in a conversation. Finally, you are looking to live in a somewhat nicer place, not a mansion with way too much space, but just-enough space. I'm charging below market rate as it's more important to me to find a good fit than get the most help with the mortgage, but I say this to describe the mentality I am looking for. The actual rent and amount of space you'd have for your stuff (up to 2.5 rooms) is negotiable if there's a good fit! and for a couple, the rent would increase by 300-500, depending on how much space you'd want to take up (there is one bedroom with closet available but I have an unoccupied bonus room with door which would either become storage or extra shared/project space).
If all this sounds interesting, please send a description of yourself, your living situations since you left college and what you are looking for *ideally* (I want this to be a mutually fantastic situation) and what you think is best in life (and of course, if you have any questions). Thanks!