There is simply no better way to experience Bremen. Strong recommendation.
The setting: authentic 'altbremerhaus' listed heritage building with wonderful historical details (hardwood floors, high ceilings, porch)
The place: extremely generous and spacious, ideal for two people (four would probably work at a stretch). Fully equipped kitchen, functional bathroom, decent Wifi across the flat. Nice outdoor space with afternoon/evening sun
The location: in a quiet part of the Ostertor Viertel, Bremen's most vibrant strip with plenty of bars (Wohnzimmer, Litfass, Eisen, Eule), restaurants, independent shops, concerts, arts, galleries, yoga studios, 24h food options (try an Arabic Rollo). For vegan dining, go to Medo (Friesenstrasse) and Engel (Ostertorsteinweg). Best breakfast @ Engel and Piano (Steintor). Located right by the river for nature (also take the Sielwall ferry over to Cafe Sand for beach life, 5 mins from Frank's place). Walking distance and good connectivity to city center and sights
The town: Bremen is a great destination full of history, alternative lifestyle, Nordic dining, maritime sights, museums (Kunsthalle and Wagenfeld-Haus just opposite each other in Ostertor, Universum for science), architecture (Schnoor area, town hall and Dom, Bremen's city center is a UNESCO world heritage site). If you like Copenhagen, Amsterdam, Berlin, Hamburg, then Bremen will be a compact, safe, cheaper and friendlier alternative. Perfect for weekends. Hard not to like the place. Combine with Berlin, Hamburg, Luebeck, Groningen or one of the North Sea or Baltic Sea islands (Juist, Ruegen, Spiekeroog) for a longer trip. Bremen suits singles, couples and families. Fairly young vibe. Excellent public transport and short distances appeal to baby boomers
Bike rental: best way to discover Bremen is by bike. Everyone is cycling here and special cycle lanes keep you safe (feels like Holland). Just stick to the rules of red lights, lighting in the dark, cycling on the right side and overtaking left (it is Germany after all and cycle lanes are governed by the same rules as the Autobahn motorways...). Speiche (Fehrfeld) is a bike store with some rental options, 3 mins walk.
Not to miss: sample some of the traditional local beers (Beck's and their local sister Haake-Beck, Hemelinger, Union...); they have been around long before the craft beer trend. Check dates for Werder Bremen, the local football team - the whole city is in green and white on match days (feels like Green Bay). If you can get one of the coveted tickets, go and see the game at Weserstadion. Spend time in Buergerpark or Rhododendronpark for green spaces (both dog-friendly)
The host: lovely and attentive during reservation, check-in and check-out. Not intrusive.
Any hack? It would be amazing if Frank and the crew invested in some bikes for their guests